@Kevin_Z issue resolved. It was the adapter's fault, somehow it was short. I checked with a different adapter and things started working. Had purchased it just a month back. Thank you ! Rohan

@Kevin_Z The router restarts please find the video attached. UPDATE: It does not matter if the ISP is connected or not, even when I simply power on the router, it restarts.

Normally a router WIFI LAN is always on even if the internet is down (from the ISP). But my new Archer C60 keeps on restarting in that case. Please suggest if any config. changes.