Asus RT-AC1200G+ Random Reboots Automatically


I bought a new Asus RT-AC1200G+ to replace my RT-AC51U for better signal and Gigabit Ethernet. It’s much faster to copy files to/from QNAP TS-119PII now. But I notice it drops internet connection several times a day, I am sure there is nothing wrong with my tethering device as described in “Android USB Tethering Drops and Data Usage Crashes, try Reset“. All the following time is GMT + 8.

On 2017/3/21, Begin to Track Auto-Restart Issue

RT-AC1200G+ restarts several times. I cannot stand for this anymore. First, I found RT-AC1200G+不定期重啟 in local community group has report the same issue and many others could be googled by “rt-ac1200g+ restarting”. Then I decide to upgrade firmware to  and see if it fix the bug.

All available firmware are on RT-AC1200G+ Driver & Tools. and. I download the latest 3.0.0.4.380.4089 and upload via [Administration] → [Firmware Upgrade] tab. Flash and reboot automatically.

On 2017/4/2, Restarts at 20:54

No, the latest firmware doesn’t solve the auto-reboot issue.

On 2017/4/4, Restarts at 20:54

Because both restarts at the same time, I search for any scheduler-like configurations and disable Enable wireless scheduler on 2.4GHz and 5GHz in [Advanced Settings] → [Wireless] → [Professional] tab.

On 2017/4/10, Reboot at 23:17

[Problem]Router keeps rebooting randomly on Asus forum suggests disabling GRO (Generic receive offload) due to its stability issue which is not available in current firmware. According to Router Guide: NAT Acceleration On or Off, I decide to Disable NAT Acceleration (default Auto) in [Advanced Settings] → [LAN] → [Switch Control] tab.

On 2017/4/11,Fine-tune Mobile Connection

I notice USB computer connection is in Media device (MTP) mode which could identified as a storage device. I decide to manually select Charging mode in the future. The default is Media device (MTP) which I cannot change on this device.

Maybe that’s why I see disk_monitor: Got SIGALRM…. This log is explained in Asuswrt-Merlin 378.54_2 is now available on SNBForums by RMerlin as:

disk_monitor is the service that handles scheduled filesystem scans. SIGALRM is the signal the process receives when it has a scheduled event occurring, which tells it to wake up, and process any scheduled event if there’s a disk present before going back into sleep.

More about Android file transfer is explained in Transfer files between your computer & Android device.

On 2017/4/13, Reboot at 14:41

Another suspect is Enable UPnP Media Server has been turned on in [General] → [USB Application] → [Media Server] tab. It seems disabling NAT acceleration is not enough, I decide to turn it off.

DD-WRT for RT-AC1200G+ is still WIP (working in progress) according to Supported Devices 3.13 Asus on DD-WRT.com. I am not sure what I should turn off next time.

On 2017/4/17, Wireless becomes Unstable and Need a Restart at 23:57

My network becomes unstable and need a restart at 23:57 (GMT+8). I am not sure if it is due to RT-AC1200G+. I use D-Link DWA-171 rev A1 on my HP ProBook 4520s. It reconnect several times today. And Mac mini (Late 2012) also the same around 11:00PM at night. Both use 5Ghz. This never happen when download Visual Studio 2017 Community during 2017/4/13 to 4/20. RT-AC1200G+ works okay without any restart.

I notice a new warning “Connection reset by peer” related to Universal Plug and Play begins on 2017/4/17. You may learn more about this in Introduction to UPnP.

According to What does “connection reset by peer” mean? on StackOverflow, it is related to an immediate dropping of the connection. I think it is related to my new download. I use the installation program on SQL Server downloads to download for offline installation. The port 2869 is used by Simple Service Discovery Protocol (SSDP) which is a Windows service for event notification explained on Network Ports Used by Key Microsoft Server Products.

Apr 17 15:50:32 miniupnpd[12235]: upnp_event_send: send(): Connection reset by peer
Apr 17 15:50:32 miniupnpd[12235]: upnp_event_process_notify: connect(192.168.1.122:2869): Connection reset by peer
Apr 17 15:50:32 miniupnpd[12235]: upnp_event_process_notify: connect(192.168.1.122:2869): Connection reset by peer

On 2017/4/18, Fine-tune UPnP, Wireless Configurations, Reset Router

My SQL Server installation program got aborted and need manual restarts several times. Because RT-AC1200G+ generates many “Connection reset by peer” in system log, I decide to re-enable Enable UPnP in [Advanced Settings] → [WAN] → [Internet Connection] tab. This messages are gone after applying but the wireless connection is still unstable.

After more testing, I realize it’s related to 5GHz only. Download speed also gets huge improve when switching to 2.4GHz.

Asus suggest to use channel 149 and 161 on 5GHz in RT-AC58U,RT-AC1300+ 這路由器Wifi 5G. For users in Taiwan, you may use following channels legally according to 電腦王:Wi-Fi 5GHz 你支援嗎?產品支援度混亂,小心頻率不相容:

  1. 5250~5350MHz(CH52 5260MHz、CH56 5280MHz、CH60 5300MHz、CH64 5320MHz)
  2. 5470~5725MHz(CH100 5500MHz、CH104 5520MHz、CH108 5540MHz、CH112 5560MHz、CH116 5580MHz、CH120 5600MHz、CH124 5620MHz、CH128 5640MHz、CH132 5660MHz、CH136 5680MHz、CH140 5700MHz)
  3. 5725~5825MHz(CH149 5745MHz、CH153 5765MHz、CH157 5785MHz、CH161 5805MHz、CH165 5825MHz)

On an informal test, download a LAMP Stack image from TurnKey Linux is around 100 to 200 kbps on 5GHz (802.11ac 1T1R @ 433Mbps with all available 5GHz channels (149, 153, 157, 161, 165)) while 50Mbps on 2.4GHz (802.11n 1T1R 150Mbps). Both with WPA2-Personal enabled and test about the same time.

Conclusion: my RT-AC1200G+ is not only has auto-restart issue but also slow and unstable 5GHz.

I decide to reset everything. Anyway, they already suggest a reset after firmware upgrade which I have never done before on RT-AC1200G常常斷線。WAN Connection: DNS probe failed. It’s said to push the reset button and hold for 10 to 15 seconds while the device is power on. Don’t release until all lights blinking. Then all settings will be reset to factory default. Backup configurations before this reset. Detail with illustration can be found in How to do a firmware update on ASUS wireless router? (ASUSWRT).

Sounds easy but this is what I get after first reset: a firmware upload page! If you see this page, just restart again. It should go back to factory default.

I get a firmware upload page after resetting my device.

Here is a list of my configurations:

  1. In [USB Application] → [Media Services and Servers], disable [Media Server] and [network Place (Samba) Share] which is default on.
  2. In [USB Application] → [3G/4G], Android tethering is identified as USB Modem. Leave it un-touched.
  3. In [Wireless], turn off WPS and set 5GHz with 80MHz and 2.4GHz with 40MHz channel bandwidth. I also assign 161 as the control channel in 5GHz because 149 has conflicts in my house.
  4. In [WAN], UPnP is turned on by default.
  5. In [Firewall], Network Service Filter is turned off by default. But I uncheck all data and apply again.
  6. In [Administration] → [System], Reboot Scheduler is turned off by default.

On 2017/4/19, Fine-tune 5GHz Wireless Configurations

I try to fix the unstable and slow issue on 5GHz today.

First, I check more detail about RT-AC1200G+ and found more information in ASUS RT-AC1200GP on WikiDevi.

  1. Broadcom BCM47189 supports 802.11ac802.11n, and 802.11a@ 5GHz.
  2. Broadcom BCM43217 supports 802.11n802.11g, and 802.11b @ 2.4GHz.

Because my wireless devices are either 802.11ac or 802.11n, I decide to change the 2.4GHz Wireless Mode to [N Only] and 5GHz to [N/AC Mixed] in [Advanced Settings] → [Wireless] → [General] tab. It provides best performance by disabling support for legacy standard.

I also change the 2.4GHz Channel bandwidth to [40MHz] and 5GHz to [80MHz] in the same tab but encounter some stability issue.

On 2017/4/20, Fine-tune 5GHz Wireless Configurations

to continue my experiment. When I set Channel bandwidth to [80MHz] with a fix Control Channel, network is slow and unstable. Even worse, sometimes I cannot see my SSID at 5GHz. I conclude there are conflicts in this combination. Maybe there are too many devices ask for 80MHz. The best solution is to lower bandwidth for a more stable wireless network.

Then I lower the Channel bandwidth to [40MHz] and Control Channel to [Auto] to . Now it works. Fast and stable! One tablet failed to see the SSID at 5GHz is solved by re-enable its WiFi.

I also learn wireless network from following pages to understand Wireless Log in [Advanced Settings] → [System Log] → [Wireless Log] tab.

  1. Best Wireless Routers Now: 20MHz vs 40MHz vs 80MHz vs 160MHz: What Channel Bandwidth Should I Use?
  2. metageek: Understanding WiFi Signal Strength
  3. Oreilly: Chapter 2. The PHY
  4. Wiki: dBm
  5. ZDNet: Gigabit Wi-Fi: 802.11ac is here: Five things you need to know

Here is what I have learned:

  1. When dBm is positive, it’s gain. Negative means loss signal strength.
  2. -80 dBm or less means unreliable.
  3. 80MHz channel bandwidth is an available option to 802.11ac but needs a clear channel range.

When I have to lower the Channel bandwidth to [40MHz] to get a clear channel range for 802.11ac, my connection speed drops from 433Mbps to 200MBps with -55 to -72 dBm on 5GHz. But it downloads a LAMP Stack image from TurnKey Linux at about 4Mbps on 5GHz and 2.4GHz, much improve than 2017/4/18.

BTW, I also add 8.8.8.8 as DNS Server in [Advanced Settings] → [LAN] → [DHCP Server] tab or it will fail to query sometimes.

Therefore, I think this case is closed. Now I have to wait and see if the restart happen again in the next few days.

On 2017/4/24, Reboot at 21:20 and Again at 21:28

As you can see below, time has been first reset after 23:00 and 08:08 again. The later also reset Uptime in [General Log]:

Apr 23 17:03:34 kernel: plcp 000b 0180 || 500f 8f1f 0000 || 7d4f 7fc1 || rxestats2 0000
Apr 23 17:03:34 kernel: txerr_tm 0021 txerr_txbytes 0000 txfunfl 0 8 0 0 0 0 txtplunfl 0
Apr 23 17:03:34 kernel: debug1 7fc1 debug2 0000 debug3 0000 debug4 0000
Apr 23 23:00:28 disk_monitor: Got SIGALRM...
Aug 1 08:00:09 syslogd started: BusyBox v1.17.4
Aug 1 08:00:09 kernel: klogd started: BusyBox v1.17.4 (2016-11-03 15:46:45 CST)
Aug 1 08:00:09 kernel: Linux version 2.6.36.4brcmarm (root@asus) (gcc version 4.5.3 (Buildroot 2012.02) ) #1 PREEMPT Thu Nov 3 15:55:43 CST 2016
...skip...
Aug 1 08:01:17 miniupnpd[426]: add_filter_rule() : chain FUPNP not found
Aug 1 08:07:55 rc_service: httpd 389:notify_rc reboot
Aug 1 08:07:56 kernel: Attempt to kill tasklet from interrupt
Aug 1 08:07:57 iTunes: daemon is stoped
Aug 1 08:07:57 FTP Server: daemon is stoped
Aug 1 08:07:57 Samba Server: smb daemon is stoped
Aug 1 08:07:57 kernel: gro disabled
Aug 1 08:00:09 syslogd started: BusyBox v1.17.4
Aug 1 08:00:09 kernel: klogd started: BusyBox v1.17.4 (2016-11-03 15:46:45 CST)

I notice the difference because Uptime in [General] → [System Log] → [General Log] tab has been reset. Usually it should keep counting from the time RT-AC1200G+ being turned on. And there is a lot of warning related to MiniUPnP, too.

Is there any relation because I switch to another Android device for tethering? I don’t know. But I decide to change Select USB device in [USB Application] → [3G/4G] from USB Modem back to Android phone to mach current scenario, it was identified as a USB Modem with another Android device on 2017/4/18.

On 2017/4/26, New Leads

I notice some suspicious message in system log.

Apr 26 20:14:58 rc_service: httpd 389:notify_rc restart_wireless
Apr 26 20:15:03 kernel: wl_module_init: passivemode set to 0x0
Apr 26 20:15:03 kernel: wl_module_init: txworkq set to 0x0
Apr 26 20:15:04 kernel: eth1: Broadcom BCM43227 802.11 Wireless Controller 9.10.178.27 (r584393)
Apr 26 20:15:04 kernel: External imprecise Data abort at addr=0x2ac8a3b0, fsr=0x1c06, pc=0x2ac6de20 lr=0x9eb0 ignored.
Apr 26 20:15:04 kernel: eth2: Broadcom BCM43c8 802.11 Wireless Controller 9.10.178.27 (r584393)
Apr 26 20:21:22 kernel: txerr valid (1) reason 0100 tst 2222 pctls 1cc2 1c0a 0022
Apr 26 20:21:22 kernel: plcp 000b 03ff || dc07 8f2a 0000 || 74c1 77ad || rxestats2 0000
Apr 26 20:21:22 kernel: txerr_tm 0033 txerr_txbytes 0000 txfunfl 0 1 0 0 0 0 txtplunfl 0
Apr 26 20:21:22 kernel: debug1 77ae debug2 0000 debug3 0000 debug4 0000

notify_rc restart_wireless means wireless devices are restart. I wonder if this is the reason for my restart issue. Both of them have been restart without interrupt my internet connection but no reboot.

But on QNAP TS-119PII with Different Wireless Device on Mac OSX File Transfer Performance Report, I have check the internal of RT-AC1200G+ as below:

According to ASUS RT-AC1200GP on WikiDevi, some important features include:
1. Broadcom BCM47189 supports 802.11ac802.11n, and 802.11a@ 5GHz.
2. Broadcom BCM43217 supports 802.11n802.11g, and 802.11b @ 2.4GHz.
3. Max speed for 802.11n is 300Mbps with 2T2R.
4. Max speed for 802.11ac is 867Mbps with 2T2R.
5. Gigabit Ethernet.

There is no BCM43227 which supports 802.11n802.11g, and 802.11b @ 2.4GHz and BCM43c8 which I cannot find any related information.

The last four repeat from 20:21:22 to 21:56:40. I have no ideas at all.

It’s a strange log and I will keep my eyes on them.

Around 2017/5/5, Unstable 5GHz without Reboot

I notice my 802.11n @ 5GHz becomes unstable because connections break and reconnect within 2 minutes.

I cannot remember the exact date and time. Just around 2017/5/5.

I also notice there is a lot of similar kernel message from 10:46:35 to 12:05:16:

May  5 10:46:35 kernel: txerr valid (1) reason 0100 tst 2222 pctls 3cc2 5c1a 0022
May  5 10:46:35 kernel: plcp 000b 0180 || 5e0f 8f1f 0000 || 92b4 9472 || rxestats2 0000
May  5 10:46:35 kernel: txerr_tm 0030 txerr_txbytes 0000 txfunfl 0 1 0 0 0 0 txtplunfl 0
May  5 10:46:35 kernel: debug1 9472 debug2 0000 debug3 0000 debug4 0000

On 2017/5/7, Unstable 5GHz without Reboot

It’s the same to 2017/5/5. My 5GHz wireless connections break and reconnect within 2 minutes at about 11:35PM.

It’s the same kernel message again:

May  7 23:37:11 kernel: txerr valid (1) reason 0100 tst 2222 pctls 3cc2 5c1b 0022
May  7 23:37:11 kernel: plcp 000b 0063 || 430f 8f07 0000 || a457 a623 || rxestats2 0000
May  7 23:37:11 kernel: txerr_tm 0020 txerr_txbytes 0000 txfunfl 0 1 0 0 0 0 txtplunfl 0

On 2017/5/8, Reboot at 10:16AM

Finally, it reboots after 14 days. The Uptime in [General Log] has been reset.

May  8 09:20:07 kernel: txerr valid (1) reason 0100 tst 2222 pctls 1cc2 1c13 0022
May  8 09:20:07 kernel: plcp 000b 00e1 || 1b07 9f09 0000 || 3c70 3e22 || rxestats2 0000
May  8 09:20:07 kernel: txerr_tm 003a txerr_txbytes 0000 txfunfl 0 1 0 0 0 0 txtplunfl 0
May  8 09:20:07 kernel: debug1 3e22 debug2 0000 debug3 0000 debug4 0000
...skip...
May  8 09:24:15 kernel: txerr valid (1) reason 0100 tst 2222 pctls 1cc2 1c13 0022
May  8 09:24:15 kernel: plcp 000b 039f || cd07 9f26 0000 || bd6e be48 || rxestats2 0000
May  8 09:24:15 kernel: txerr_tm 003b txerr_txbytes 0000 txfunfl 0 14 0 0 0 0 txtplunfl 0
May  8 09:24:15 kernel: debug1 be48 debug2 0000 debug3 0000 debug4 0000
May  8 10:00:20 disk_monitor: Got SIGALRM...
Aug  1 08:00:09 syslogd started: BusyBox v1.17.4

PawelW from Poland share a new beta firmware RT-AC1200G+_9.0.0.4_380_7415-gc949b277fca.trx which works great on his machine in the comments of this post.

I share this good news to Asus Forum with subject “哪裡可以下載 RT-AC1200G+ 台灣新 Beta 韌體 380_7415?” and ask for local beta firmware because every country has its public channel sets. Asus reply there is no official link for new beta firmware.

小昱 who read my post and decide to give it a try. This firmware works great for him. Everything seems okay now.

Okay, now we have a new beta firmware. There are two people go for it. I decide to go another way. See if I may find tune my configuration. I found many interested information today.

On Asus RT-AC1200G, BCM47189+ BCM43217 chipset on OpenWrt, I learn new to commends to explore RT-AC1200G+ through ssh.

  1. Enable SSH Daemon in [Advanced Settings] → [Administration] → [System] Tab for [LAN only]. If you want to access from WAN, read Enable SSH on Asus Routers with(out) SSH Keys on HTPC Guides
  2. Use dmesg to display kernel messages. I notice same eth1 and eth2 messages on 2017/4/26. And also many error.
  3. Use nvram show to display configuration in flash.
  4. Use uname -r to get Linux version 2.6.36.4brcmarm on RT-AC1200G+.

I also learn following facts from the thread:

  1. Broadcom BCM47189 is similar to BCM53573 with 100MHz higher frequency and both are ARM Cortex A architecture. They are both identified as arch/arm/mach-bcm53xx as a Broadcom SoC with ARM Cortex A9 CPU in OpenWRT kernel.
  2. changeway believe A7 is similar to A9 arch, but need to patch some driver to support BCM47189 and ARM Cortex A7.
  3. changeway believe the wireless may support by b43.

Then I read Broadcom BCM47xx on OpenWrt to learn more about the Linux wireless driver, it seems b43 is used to support BCM47189 @ 5GHz according to this. When I follow the lead to read b43 on Linux Wireless, I found BCM43217 @ 2.4GHz is on the supported list but no BCM47189 @ 5GHz. And there is a know problem looks similar to my wireless issue on 2017/4/17 :

Scanning/connectivity problems: caused by b43 bug exposed with kernel 3.8 (by 0172bb7). Fixed in kernel 3.14 (by 64e5acb) and backported to 3.13.2, 3.12.10, 3.10.29.

I think maybe the kernel message and unstable 5GHz is related to support for BCM47189 @ 5GHz in wireless driver.

I decide to drop the support for 802.11ac by setting Wireless Mode to [N only] in [Advanced Settings] → [Wireless] → [General] Tab.

On 2017/5/10, Reboot at 13:15

The Uptime in [General Log] has been reset.

I drop 5GHz by setting Enable Radio on  5GHz to [No] in [Advanced Settings] → [Wireless] → [Professional] Tab. Then I keep on receiving similar messages going on all day:

May 10 13:24:40 kernel: txerr valid (1) reason 0100 tst 2222 pctls 3cc2 5c1b 0025
May 10 13:24:40 kernel: plcp 000b 006f || 3f0f 8f08 0000 || 722b 7288 || rxestats2 0000
May 10 13:24:40 kernel: txerr_tm 001c txerr_txbytes 0000 txfunfl 0 1 0 0 0 0 txtplunfl 0
May 10 13:24:40 kernel: debug1 7288 debug2 0000 debug3 0000 debug4 0000

txerr should be Transmit Error but I have no ideas why.

Once I drop 2.4GHz by setting Enable Radio on  2.4GHz to [No] in [Advanced Settings] → [Wireless] → [Professional] Tab, all above messages stops.

Anyway, I will start by disabling 5GHz. If it doesn’t work, I will stop 2.4GHz and re-enable 5GHz next time.

I also get a respond from Hong Kong local community. fatdog suggest to use firmware 3.0.0.4.380_3971-g516a6d6 and schedule reboot every day in Asus RT-AC1200G+不定期重啟 #11. He has no problems at all. I will give it a try after above option. (Update on 2017/5/13: due to 40 Asus RT Router Models Are Vulnerable to Simple Hacks on BleepingComputer, I will give up this suggestion).

Here I got two bad messages. PawelW reports that the beta firmware RT-AC1200G + _9.0.0.4_380_7415-gc949b277fca.trx eventually crash after 19 days. nikisi on Asus suppport forum also reports in [Sharing]A diary to solve Asus Rt-AC1200G+ reboot issue that the link to beta firmware is no longer available.  (Update on 2017/5/12: PawelW provides a new link to download in his new reply)

On 2017/5/12, Freeze at 13:13PM

I see warning message continuously generated after disabling 5GHz from 2017/5/10. Finally it freeze today. For those already connected, they won’t be able to access internet. Others won’t see the SSID. I have to restart RT-AC1200G+ with its power button.

May 12 11:22:19 kernel: txerr valid (1) reason 0100 tst 2222 pctls 3cc2 5c1b 0022
May 12 11:22:19 kernel: plcp 000b 0474 || 6b0f 8f5f 0000 || 0581 5dc2 || rxestats2 0000
May 12 11:22:19 kernel: txerr_tm 001c txerr_txbytes 0000 txfunfl 0 248 1 0 0 0 txtplunfl 0
May 12 11:22:19 kernel: debug1 5dc2 debug2 0000 debug3 0000 debug4 0000

Now, I have no disable 2.4GHz and re-enable 5GHz in [Advanced Settings] → [Wireless] → [Professional] Tab.

On 2017/5/13, Change Network Topology

Some of my device doesn’t support 5GHz. Therefore I disable 5GHz and DHCP of RT-AC51U. Use LAN to LAN to connect RT-AC51U to RT-AC1200G+. The former will be responsible for 2.4GHz while the later is 5GHz. How to Connect Two Routers on wikiHow has great illustration and explain in plain English.

Both of my NAS are connected to the Gigabit Ethernet of RT-AC1200G+ while Mac mini is 802.11n @ 5GHz with 2T2R at 300Mbps. Copying a single 3.87Gb file is about 25 MB/s. Only those connected to RT-AC51U will be limited by the slow Fast Ethernet.

I may print to my wireless printer which only has 2.4GHz capability through this LAN to LAN topology.

On 2017/5/15, Reboot at 10:12AM But Reconnect WAN Automatically

It’s a different experience. I notice my internet connection has been dropped. Mac mini detects no 5GHz from RT-AC1200G+ and switch to 2.4GHz on RT-AC51U but fails. After a while, I may connect to 2.4GHz and login to RT-AC1200G+. I notice the Uptime in [General Log] has been reset. Strangely, WAN was restored automatically. No need to reset tethering on Android mobile.

May 15 10:00:34 disk_monitor: Got SIGALRM...
Aug 1 08:00:09 syslogd started: BusyBox v1.17.4
...skip...
Aug 1 08:01:07 WAN Connection: WAN was restored.
Aug 1 08:01:09 ntp: start NTP update
May 15 10:13:26 rc_service: ntp 783:notify_rc restart_upnp

Conclusion

Conclusion, even turning off wireless features on RT-AC1200G+, the best is to restore WAN automatically. There is no way to stop the reboot.

1st RMA: From 2017/5/15 till Now

On 2017/5/15, I contact Asus and get a RMA code. Print this post together with my RT-AC1200G+ to send back to Asus at 15:30.

On 2017/5/16, a tech support form Kaohsiung call me at 17:37. He ask me several questions which I have already provide the detail in my post. Maybe it’s the routine conversation or he doesn’t have time to read this long report. At the end, he decide to send me a new replacement and upgrade to the latest firmware.

On 2017/5/17, the same tech support contact me that a research and development engineer will investigate my case. They need to keep my RT-AC1200G+ and there will be no replacement during that period.

It’s a good news to me because a replacement won’t solve the reboot issue which I have learned from many others before.

On 2017/5/19, the same tech support contact me that he cannot reproduce reboot with GbE. I instruct him to reproduce reboot in 3 days by:

  1. Enable 2.4GHz and WPA2. Errors may be found in system log immediately.
  2. Enable 5GHz with 80MHz bandwidth and WPA2. Wireless network becomes unstable within 3 days.
  3. Use Google Drive to monitor if it’s still connected to Internet.

You have to be a good tech support to instruct them step-by-step with patient and love when a tech support calls. Don’t forget to summarize at the end or they will forget what have talk about. Most people won’t read the manual (my printed 14-page report) even it is in printed material with two copies.

I will begin to test when I get it.

If you are interested in the whole RMA process, please follow my post.

Auto-restart History

Version On Issue and Notes
3.0.0.4.380.3310 2017/3/10 New installation.
3.0.0.4.380.4089 2017/3/21 Restart automatically several times.

Install new firmware.

x 2017/4/2 Restart automatically at 20:54.
x 2017/4/4 Restart automatically at 20:54.

Disable Enable wireless scheduler on 2.4GHz and 5GHz

x 2017/4/10 Reboot at 23:17 on 2017/4/10.

OSX Finder warns Server connections interrupted which seems due to restart.

Disable NAT acceleration and need to restart.

x 2017/4/11 Manually select USB computer connection in Charging mode.
x 2017/4/13 Reboot at 14:41.

Manually select USB computer connection in Charging mode.

x 2017/4/17 Unstable network and need a restart at 23:57.
x 2017/4/18 Re-enable Enable UPnP in WAN.
x 2017/4/19 Reset and reconfiguration:

  1. In [USB Application] → [Media Services and Servers], disable [Media Server] and [network Place (Samba) Share] which is default on.
  2. In [USB Application] → [3G/4G], leave Select USB Device to [USB Modem].
  3. In [Wireless], turn off WPS and set Channel bandwidth on 5GHz for [80MHz] and on 2.4GHz for [40MHz]; set Wireless Mode on 2.4GHz to [N Only] and on 5GHz to [N/AC Mixed].
  4. In [WAN], UPnP is turned on by default.
  5. In [Firewall], Network Service Filter is turned off by default. Uncheck all selection and apply again.
  6. In [Administration] → [System], Reboot Scheduler is turned off by default.
x 2017/4/20 In [Wireless], set Channel bandwidth on 5GHz to [40MHz] and Control Channel on 5GHz to [Auto].
x 2017/4/24 Reboot at 21:20 and again at 21:28.

Change Select USB device in [USB Application] → [3G/4G] from USB Modem back to Android phone.

x 2017/5/8 Reboot at 10:16.

Set Wireless Mode on 5GHz to [N only] in [Advanced Settings] → [Wireless] → [General] Tab.

x 2017/5/10 Reboot at 13:15.

Set Enable Radio on  5GHz to [No] in [Advanced Settings] → [Wireless] → [Professional] Tab.

x 2017/5/12 Freeze at 13:13.

Set Enable Radio on  5GHz to [Yes] but 2.4GHz to [No] in [Advanced Settings] → [Wireless] → [Professional] Tab.

x 2017/5/15 Reboot at 10:12 but WAN was restored automatically.

Current Configuration

After install to official latest stable version 3.0.0.4.380.4089, reset and configure as below:

  1. In [USB Application] → [Media Services and Servers], disable [Media Server] and [network Place (Samba) Share] which is default on.
  2. In [USB Application] → [3G/4G], set Select USB Device to [Android phone].
  3. In [Wireless], turn off WPS and set Channel bandwidth on 5GHz for 80MHz; set Wireless Mode on 5GHz to [N only]; set Control Channel on 5GHz to [Auto]; set Enable Radio on  2.4GHz to [No].
  4. In [WAN], UPnP is turned on by default.
  5. In [Firewall], Network Service Filter is turned off by default. Uncheck all selection and apply again.
  6. In [Administration] → [System], Reboot Scheduler is turned off by default.

Reference

  1. Android USB Tethering Drops and Data Usage Crashes, try Reset
  2. Apple: Mac mini (Late 2012) – Technical Specifications
  3. Asus Forum: [Problem]Router keeps rebooting randomly
  4. Asus Forum: RT-AC58U,RT-AC1300+ 這路由器Wifi 5G
  5. Asus Forum: RT-AC1200G常常斷線。WAN Connection: DNS probe failed
  6. Asus Forum: 哪裡可以下載 RT-AC1200G+ 台灣新 Beta 韌體 380_7415?
  7. Asus Support: How to do a firmware update on ASUS wireless router? (ASUSWRT)
  8. Asus Support: Introduction to UPnP
  9. Asus Support Forum: nikisi
  10. Asus Support Forum: [Sharing]A diary to solve Asus Rt-AC1200G+ reboot issue
  11. Asus: RT-AC1200G+
  12. Asus: RT-AC1200G+ Driver & Tools
  13. Asus: RT-AC51U
  14. Best Wireless Routers Now: 20MHz vs 40MHz vs 80MHz vs 160MHz: What Channel Bandwidth Should I Use?
  15. BleepingComputer: 40 Asus RT Router Models Are Vulnerable to Simple Hacks
  16. DD-WRT
  17. DD-WRT: Supported Devices 3.13 Asus
  18. Google: Nexus Help: Transfer files between your computer & Android device
  19. HKEPC: Asus RT-AC1200G+不定期重啟 #11
  20. HKEPC: fatdog
  21. HTPC Guides: Enable SSH on Asus Routers with(out) SSH Keys
  22. Linux kernel source tree: cfg80211: use DS or HT operation IEs to determine BSS channel
  23. Linux Wireless: b43
  24. Linux Wireless: System on a chip
  25. LWN.net: JLS2009: Generic receive offload
  26. metageek: Understanding WiFi Signal Strength
  27. Microsoft: Network Ports Used by Key Microsoft Server Products
  28. Microsoft: SQL Server downloads
  29. MiniUPnP Project HomePage
  30. Mobile01: RT-AC1200G+不定期重啟
  31. OpenWrt: Asus RT-AC1200G, BCM47189+ BCM43217 chipset
  32. OpenWrt: Broadcom BCM47xx
  33. OpenWrt: changeway
  34. OpenWrt: NVRAM usage on OpenWrt ‘WhiteRussian’
  35. Oreilly: Chapter 2. The PHY
  36. QNAP TS-119PII with Mac OSX File Transfer Performance Report
  37. QNAP TS-119PII with Different Wireless Device on Mac OSX File Transfer Performance Report
  38. Router Guide: NAT Acceleration On or Off
  39. SNBForums: Asuswrt-Merlin 378.54_2 is now available
  40. StackOverflow: What does “connection reset by peer” mean?
  41. TurnKey Linux: LAMP Stack – Web Stack (MySQL)
  42. Wiki: dBm
  43. Wiki: dmesg
  44. Wiki: Dynamic Host Configuration Protocol
  45. Wiki: Fast Ethernet
  46. Wiki: IEEE 802.11a-1999
  47. Wiki: IEEE 802.11ac
  48. Wiki: IEEE 802.11b-1999
  49. Wiki: IEEE 802.11g-2003
  50. Wiki: IEEE 802.11n-2009
  51. Wiki: Gigabit Ethernet
  52. Wiki: Reboot (computing)
  53. Wiki: Secure Shell
  54. Wiki: Service set (802.11 network)
  55. Wiki: Universal Plug and Play
  56. Wiki: Wi-Fi Protected Access
  57. WikiDevi: ASUS RT-AC1200GP
  58. WikiDevi: Broadcom
  59. wikiHow: How to Connect Two Routers
  60. WikiDevi: D-Link DWA-171 rev A1
  61. ZDNet: Gigabit Wi-Fi: 802.11ac is here: Five things you need to know
  62. 電腦王:Wi-Fi 5GHz 你支援嗎?產品支援度混亂,小心頻率不相容
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37 thoughts on “Asus RT-AC1200G+ Random Reboots Automatically

  1. RT-AC1200G+ here, same behavior.
    Not sure if it adds something, but I`m using my RT-AC1200G+ in AP mode (connected to a Mikrotik router) and it also is rebooting (once or twice a day)… so I guess the problem is not related to any router feature but the wifi itself.

    I just changed the 5G band to 40Mhz too, let`s see what happens.

    Like

    • Hi,

      Thanks for sharing! I do see less warning with my latest configuration but it reboots last night again. I will update my post later.

      Keep in touch! 🙂

      Like

    • Hi, just FYI. It’s almost 8 days since last configuration. No restart. Is there any good news from you?

      Like

      • Yes!!!
        It is weird because just like in your case, in the following 4 days after I modified the 5GHz Channel bandwidth to 40Mhz it keep rebooting some times… and then it some day suddenly stopped…
        The current Uptime is 4 days 1 hours 55 minute(s)… let`s hope it stays like that… I will keep monitoring it in the next weeks.

        Liked by 1 person

    • Hi hitchhiker,

      PawelW offers a link to a new beta firmware. One reports it works great in Taiwan. I check with Asus Taiwan there is no official link to this firmware to public.

      After 13 days, it finally crash. I check many threads and think maybe it’s related to the wireless driver in Linux kernel. Therefore, I set 5GHz to 802.11n only. See if the compatibility gets any improvement.

      You may check my latest update in this post.

      Cheers!

      Like

    • Hi hitchhiker,

      How is your router? I have update to 2017/5/13 and disable 2.4GHz on RT-AC1200G+ for the last test. I use LAN to LAN to use my old RT-AC51u to provide 2.4GHz capability.

      Wish to hear form you soon!

      Like

  2. Hello gentlemen.
    I have the same problem as you. Basically I had it. I think the problem has been solved. No restart for two weeks. I turned to Asus for help. They sent me a link to two beta firmware.
    https://www.asuswebstorage.com/navigate/s/09BC5426FD364BB486805459E402EDAFY
    First I uploaded newer firmware (RT-AC1200G + _9.0.0.4_382_9959-g648a694.trx), but I quickly resigned from this version because no device saw the ASUS network at 2.4GHz. The ASUS5 band on the 5GHz band was clearly visible.
    I have downloaded the second, older firmware (RT-AC1200G + _9.0.0.4_380_7415-gc949b277fca.trx) and there are no problems with this release.
    Both networks (2.4 and 5) are available. Restart for two weeks lack. The router is working stably.

    Sorry for my English. (Google translator … :))

    Like

    • Hi PawelW,

      Thank you for sharing the good news of beta firmware. I expect to see a stable version for local user soon!

      For those who want to use the link, please check with your local wireless regulations. Selectable channels are probably different.

      With my own configuration set, it doesn’t restart for 13 days with firmware 3.0.0.4.380.4089 yet.

      I will wait for two more weeks. If there is no restart, I will write a new post and share my configurations in a better way. This post looks more like a diary and difficult to know what I have set. 😦

      Please keep in touch!

      Have a nice day!

      Best regards,

      Amigo

      Like

  3. Unfortunately after 19 days of work the router has restarted … 😦
    This beta firmware does not solve the problem.

    Like

    • Hi,

      Which link? If you mean firmware, it seems to be removed by someone. Nothing I can do. 😦

      Do you have the same reboot problem?

      Have a nice day!

      Like

    • Yes, it has been removed. Please use the “Reply” under your first comment for future questions. It would be easier to read.

      Like

  4. i have Yellow led right (ì) blinking in router menu’ is a problem???i have called italian asus support in no….

    all you have same??? my router is attacched on modem router via wan port.. thanks

    Like

    • Hi massimo,

      Try to reset firmware to factor default which I have explain in “On 2017/4/18, Fine-tune UPnP, Wireless Configurations, Reset Router”.

      Use reply in your thread instead of creating a new thread or nobody knows what’s going on.

      Like

    • Hi nikisi,

      Because PawelW has report it reboots after 19 days and both you and massimo are testing the new firmware, I decide to print this post (14 pages, OMG) together with the machine for RMA. I will keep track of my RMA results and see if we may solve this issue together.

      Keep walking! 🙂

      Like

  5. Hello All,

    I have got the same issue I manage to replace my device in the shop however new device got the same issues… I was trying to play with several settings. I will try to replace firmware form above links.

    Like

    • Yes, I believe a hardware replacement won’t work. I have even disable 2.4GHz and 5GHz and still reboot.

      Like

      • Can you backup the complete programmer firmware from SSH to me?
        FULLFlash BACKUP
        你能不能備份一下你路由器的CFE,或者備份你路由器的完整編程器固件.不是升級固件謝謝。

        Like

      • No, I cannot. It’s already in RMA now. I didn’t have my router and don’t know when it will return. They want to keep it for study. You may try HKEPC. Maybe local community may help.

        Like

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