I bought Archer C6 router in Auguest and untill last 10 days it was working perfectly fine as a happy customer. However since last 10 days I am observing frequent disconnection, both on the LAN  (Wired and wireless 2.4Ghz and 5Ghz). It happens every hour for atleast once and last for about 40 seconds and comes back aoutomatically. I am using LAN connection to one of my desktop and when I do ping to LAN GW get the request timed out. Pls find the below system logs from router.

I have tried followings:

1) firmware upgrade

2) disable onemesh, smart connect.

3) factory reset

Kindly help as we are heavily dependent on the internet connection and on this router as unable to work and kids cant attend online schooling.