For anyone else having this issue, anyone interested in the "conclusion" of this issue, and anyone landing here from a google search in about 10 years, I have a small update.
I did file an informal FCC complaint. Cox started up with more in-home visits at first, which turned up very little. One guy changed a line coming from our pole to our house when he found 4 splitters along our existing line. Another guy changed a fitting on side of our house that had been changed out previously.
About halfway into the process (apparently they have 30 days to reach a resolution), outdoor line techs started to investigate lines in our neighborhood and around our specific node. From what I understood, a line that was important to our node was found to be loose and was refastened. There were also two customers disconnected for "excessive gaming" and causing about 20% of the total feedback for our node.
Between the outdoor fitting being changed (again) and the outdoor team working to find faults in the lines, the issue seems to have calmed down. I've not been able to monitor the connection closely, but I did not experience a restart last night. We are at a stage now where I am trying to figure out how to monitor and see if the problem is resolved while not being home as much.
I would say that you should save an FCC complaint as a last resort, and only for egregious service interruption. BUT, in my case, it got me out of the low-level support rut that I had been stuck in for about 3 months.
I'll come back and update this again if it turns out the issue was not fixed. I just wish I could point to a more definite cause for future reference!
