I started often see that router (Archer C80), started to restart it self and flash all indicators green, but power indicator start to blink really fast, even after restart it still blinks really fast. After i was thinking it was a problem with hardware, but after uptading it still blinking. I dont know how to fix it, because I tried all things that I found in internet, but they didn't worked. Because the metods fix it for just like 1-3 hours and after it restarted again and starts blink. I found something in system log, but I think it not that useful.

"1 EXCEPTION Auto update prepare to upgrade, user call download firmware service.

2 EXCEPTION Auto update prepare to upgrade, user call download firmware service.

3 INFO 0days, 00:00:07, [tmpd]register tmp app, type: 1

4 INFO 0days, 00:00:07, [portal]portal init

5 INFO 0days, 00:00:07, [lan]LAN: Set interface br-lan0 ip=192.168.0.1 netmask 255.255.255.0.

6 INFO 0days, 00:00:07, [tmpd]register tmp app, type: 2

7 INFO 0days, 00:00:08, [tmpd]register tmp app, type: 4

8 INFO 0days, 00:00:30, [DSLite]Dslite disable

9 INFO 0days, 00:00:31, [portal]portal not enabled

10 INFO 0days, 00:00:31, [portal]portal stop

11 ERROR 0days, 00:00:31, [l2tpd]Unable to load config file

12 INFO 0days, 00:00:31, [httpd]Http server start!

13 INFO 0days, 00:00:34, [wan]Wan ethernet port plug on."

I really dont know what is this, but i guess it something with hardware or with connection, but I dont know. I very thank any help. :(