@S0ad 

Few additions:

- I tried to change all the network cables does not help

- There are several other devices in this socket so that should not be the problem

- Provider is Digi (in EU) there is a router/modem from them, but that is in bridge mode (so my router connects to the internet directly not theirs, also it's web interface is not reachable, it's on "bypass" mode)

I'm not sure if it's overheating (does not feel hot just warm), if it's firmware issue or the router is faulty. I still have warranty on it.

Thank you.

@Kevin_Z 

Hey Kevin_Z,

Please see below:
- "How did you distinguish the router restarts, are all the LEDs turn off then on automatically and the internet on it will temporarily down then recover? How long does this process take?" Just like you described all LEDs go off, power LED starts to blink, then all comes back, and the routers connects back to the internet. It takes 2 mins to reboot and connect back to the internet.

- "Is it a Dynamic IP setup on the A9 or PPPoE?" PPPoE

- "How many devices are connected to the router, wired, and wirelessly? What are they? What if you reduce the numbers? You may try to optimize your wireless network, for the devices with small traffic, please connect them to the 2.4G network, like smart devices; for the devices with high traffic, please connect them to the 5G wireless network, like the smartphone/PC/TV, etc." Wired: PC, smart TV, Synology NAS. Wireless: Just my notebook(I use it only for work) phone and sometimes the tablet. The router restarts even if only the phone is connected only and I start the speedtest. I don't know if I should bother optimizing here, as there is no high bandwidth over WiFi. I could not change the channel mode as "Smart Connect" was turned on, my fault sorry about that. :D

Now I can see the mode and channels, did a few tests by starting speedtest on my phone (note: sometimes the router restarted even when I was changing settings):

802.11b/g/n mixed - 802.11a/n/ac mixed
- High transmit power 5Ghz: restart
- High transmit power 2.4Ghz: no restart ( I don't want to switch to 2.4Ghz for obvious reasons)
- Medium transmit power 5Ghz: restart (didn't see the point to test with 2.4 Ghz)
- Low transmit power 5Ghz: no restart

802.11b/g/n mixed - 802.11n/ac mixed
- High transmit power 5Ghz: restart

802.11g/n mixed - 802.11a/n/ac mixed
- High transmit power 5Ghz: restart

If you want I can continue these tests, but I only had so much time. Also I'm not sure if it's good for the router. ;) 
I will keep the low transmit power for now with smart connect turned on as it seems to be stable. I have no idea what could cause the restarts (software related, overheating(device is not hot just warm) or interference with other WiFi, but I would need a reason for it or if I should have this RMAd with warranty, I think I still have 1 year left of it.

Thank you for your time and help!

@davidbrok1 

I would try the usual things (if the whole router restarts):

- Try to plug it into another socket

- Check if there is any newer firmware, or reinstall the current one

- Try to reproduce the issue. If it was running without any problem for a year or so, what has changed? New device added? Try to exclude it.

- Try to narrow it down. Try to decrease the connected devices. Or check if it still restarts when only cabled/wireless devices are connecting.

- Try to change the cables

Unfortunately it works like this, you need to spend time with it to find where the issue is then it will be easier to find the solution.

S0ad wrote

Hello all,

I tried to contact TP-Link support a few weeks ago but no answer so far. I have the following issue:

A week ago my router started to restart random times. (I had a factory reset before due to moving I had to reconfigure everything, but I don't think it's related)

 

What I have tried:

- restart

- factory reset

- reinstall the newest firmware

 

Nothing have helped. After fooling around I managed to reproduce the issue by starting a speed test over WiFi (I tried from iPhone and android tablet, both speed test caused the router to restart).

After this and more fooling around I figured that if I turn off the WMM feature for 2.4Ghz WiFi (even though my devices connect via 5Ghz) I can run the speed test without problem but the router still restarts every now and then (once a day or so...)

 

After reading more forums I found that some people's problem got solved by changing the Wi-Fi channel to manual and mode from 802.11b/g/n mixed, but it seems like I don't have such option to do so.

 

So I would have the following questions:
- Has anyone encountered and managed to solve this kind of issue?
- Is there any way to change the Wi-Fi channel to manual and mode from 802.11b/g/n mixed with the newest firmware?

- If anyone would have idea to try out? Would be appreciated.

 

Installing 3rd party firmware would probably solve the issue but I don't want to unless it's necessary.

Thank you for the help! :)

@S0ad