Internet Constantly Dropping - Bad Modem or Bad Lines?

I’ve been fighting this issue for longer than 2 months now, but it’s gotten worst. 

My internet constantly comes in and out making it impossible to work. I had a tech come out and he swapped out some taps that he said were corroded. That helped briefly, but the last 3 days I can’t go 15 minutes without a connection interruption. When I call support, they tell me I have too many devices and try to sell me on higher speeds or CoxCares. Below are my current modem readings and errors. When the outages occurred my upstream power levels jump above 53 on at least 3 channels.