Modem keeps resetting itself T3 T4 timeouts

I'm am very frustrated at this point. Already tried chatting online with an agent and get the usual everything looks good on our end line. This began happening Tuesday morning. My new modem/router is getting these repeated unicast maintenance ranging no response received messages in the event log and will only lock onto 1 upstream channel. Then after about 5 to 10 minutes it will recycle or reset and goes through this process again. My old modem a surfboard6580 will get the same messages in the event log but was not resetting itself until today when I tried chatting with an agent and she asked for the new modem serial and MAC id. Now on both modems I can only access the internet for a few minutes at a time before they reset/recycle. It seems I cant chat with an agent anymore as if they put me on a block list for now. The old modem worked fine without resetting itself until the first agent I chatted with did whatever she did. All posts i see about T3 and T4 timeouts and modems resetting suggest to check to make sure everything it tightly connected, buy some power amplifier or have a tech come check the wiring. Having a tech come out seems impossible due to the virus panic right now so I don't know what to do. I wish i hadn't chatted with that first agent as the old modem was working without resetting itself even with those T3/T4 timeouts. Someone please help me.