Dynamic Range Window violation / Started Unicast Maintenance Ranging - No Response received -

After a recent power outage we've been having problems with out internet cutting in and out almost on the hour. One hour it will be fine, the next its cutting out every ten to fifteen minutes for as long as fifteen minutes. I began trouble shooting by resetting the router, rebooting the router, unplugging it for a few minutes and plugging it back in, switching coaxial cables, moving it to another outlet, none of that worked.

I checked the diagnostics and this is what I get:

(5) Dynamic Range Window violation

Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out

Honoring MDD; IP provisioning mode = IPv6

The issues are persistent via LAN and on wireless. I'm still troubleshooting the problem but hopefully someone here can help. Oh and the router is a Netgear C7000 V2 and I am using Xfinity.