I am having this same problem. It happens about once every 2 weeks or so and is random. My recorded show just stops, and when I exit, the top 3rd of the screen is darker. By doing a restart I can get back to normal. But I then have to watch the show ON DEMAND, because if I go back to the DVR recording, the same thing happens in the same spot.
I'm having the same issue except it happens on anything I watch from my dvr. The recording will just freeze for 10-20 seconds, screen will go dark with the progress bar showing with the 3 dots in the middle and the top 1/3 of the screen appears darker. Only way to recover at that point is a reset.
About ready to take the box to xfinity store and ask them to switch it out.
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