I have the same issues with my Archer C1200 V1 too. Recently upgraded my firmware but I doubt if the problem is really solved. I did some research and sifted through the firmware blame comments. Finally, I found a Youtube video of another TPLink Router owner with slightly different issues:

How to fix a rebooting or stuck TP-Link Router W8960N - I wish I knew this earlier!

I guess that insufficient power supply will cause the router to "dim out" and thus causing a restart.
I might try to get a higher amp rating power adaptor instead (2A instead of 1A) and see if the problem will be solved.
Any of you tried using a higher amp P/S adaptor for this router before?

Nope. If the firmware is the problem source, I will get the GPL source code and perhaps debug it to find out the root cause.

Edit: I searched for rooter goldenorb and found the website. Flashing the router might change the power requirements as well.
Of Modems and Men - Modem Power Consumption


This post has been edited by chuanway: Nov 20 2017, 02:06 PM

Hi guys,

For those that are having problems with TP-Link Archer C1200 random reboot, I recommend flashing the firmware with this older beta version:
C1200v1_eu-up-1.0.2 Build 20161128 rel.53072.zip

I browsed the TP-Link website forum and came across this information posted by a user (credits to Civic, whoever you may be).
So far, I have tried that beta firmware for a week and didn't come across any random reboots yet. Oh, and I can delete the System Log entries in this version. (unlike the current version where the System Log will display again even after deleting entries)

Source (TP-Link forum): Archer C1200 random auto reboots

Have a nice day