At a loss… internet slow / out every night.

I have tried Xfinity customer support, I have emailed with the Comments for Tom Karinshak address, I have had two agents out to my home, had a new cable line buried, had countless hours of my time wasted on the phone “troubleshooting” with agents. Nothing seems to work. For over a month my wifi has seemed to slow down to 5-10mbps or goes out completely, almost always in the evening.. Xfinity says they see no outages or concerns, modem and everything in the house looks “perfect”. The last technician that came out stated it was a problem with the street pole and conflicting frequencies being too high to a point where they overload. He said the house wiring, modem, frequencies, etc. is all working perfectly. Unfortunately he said the work on the pole would have to be done by a maintenance team and he would submit the ticket for them to pick up. According to xfinity support agent, no ticket was submitted. Even if it was submitted, the problem is only occurring at nights, so if the truck comes by during the day they will not see an issue and leave.  I have been a customer of xfinity for 25 years and have never had concerns like this be unsolved for weeks on end.  Any suggestions on what to try next? I can’t even fathom the hours I’ve spent trouble shooting this to no avail.