My Comcast/Xfinity DVR will stop playback of a recorded movie, too, but usually within a few minutes of the beginning of the playback. It doesn't matter what time of day it is. My recordings will stop playback during regular business hours as well as late at night, pre-dawn, etc. This problem just started happening about a week ago (around 8/31/2018 or 9/1/2018), and, from what I've observed (at least in my case), only seems to affect recordings that I've already watched. I noticed that this issue has been happening to other Xfinity customers for several years. If I mark a recording "Unwatched," the problem disappears.
Another issue is that I've been seeing the "DVR not available" message more frequently in the last week or so. This messsage appears at all times of the day. If I restart a recording's playback (again, usually after marking it "Unwatched"), then the DVR works fine. I think the problem is probably that Xfinity released a bad update recently.
The recent problems I've had with the Xfinity DVR are really the last straw, as far as I'm concerned. I pay way too much money each month to have the problems that I've been having since I switched to Xfinity in 2016. I am coming very close to cancelling my cable and going with SlingTV. I might have to still deal with Xfinity for Internet, but at least I won't have to deal with their terrible cable service.
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