Connectivity issues for years

I have had my connection drop out several times per hour for a couple years now. I have had three different techs at the house with no change to service. I printed the error log from my modem and the techs didn’t even look at it. I have replaced my modem twice, put it a new router, and replaced the line into my house. No change, is there anything else I can do? I feel like it’s a larger problem that Cox was not willing to admit to or fix.