Arris router resets multiple times a day

Hi, My Arris TG1652 has been having some problems lately, Each day the connection would drop multiple times and or the router would just restart itself.

The interenet is being provided via a COAX cable which is connected to the router through a COAX Isolator.

In the settings, everything seems fine, and I've done factory resets and etc, and still hasn't helped, Jumped into the more "advanced" details of the router, and I see this: https://imgur.com/a/mfD1wRs

Then while checking the event log I see these errors:

No Ranging Response received - T3 time-out;

TCS Fail on all Upstream Channels;

Unicast Ranging Received Abort Response - initializing MAC;

DHCP RENEW FAILED - Critical field invalid in response;

and it happens ALL the time.