DVR recordings corrupt AND HORRIBLE service from Xfinity

I'm having multiple issues with our DVR both while watching on the TV and using Xfinity stream on MacBook. After doing system refresh and restarting the box etc I chatted customer service online. While investigating the problem I was disconnected three times from the agent. After the third time I gave up. The service is terrible and they should be ashamed.

Some of my recordings are unwatchable. I start the recording and it immediately says I have already watched it and asks if I want to delete it. When I say no I get an error code. Often while watching a recording when I try to fast forward or do the 30 second forward it will either restart or go to some random place in the recording. When I try to stream a program the same thing happens. Even if I try to pull a slider bar to a certain place (eg the 30 minute mark) it won't let me. Instead it will to another time mark like 47 minutes. It is extremely frustrating and I am not sure what to do about it. Calling the "support" number is ineffective. They just want to troubleshoot using a bot and ask me to do the reboot/refresh which I've already done.

Perhaps someone online here can assist....