To answer your questions: I have one DVR and one companion box. The audio is off from the video on the DVR box, not the companion box, and I have tried different HDMI chords, different brands, different lengths, better AWG grades, etc. The sync is typically off by a quarter to a half second. It happens on both live TV and playback of recorded video. The companion box won't even let me watch my DVR'd programs for longer than a minute before it stops and says "DVR playback error." The last technician who came to our house said that there's no point in even swapping the boxes out again because it won't do anything...Comcast knows about the issue, and he has the same issue at his house. So why is Comcast selling us this junk?
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I've had this problem for three weeks since X1 was installed. I didn't have the problem on my previous (non-X1) boxes. Do not let Comcast tell you it is an issue with your HDMI chords, and here's why. I've had two technicians come out to take a look at it. The first one said it was an issue with my HDMI chord - but I am having the problem with different HDMI chords that we tried, so that wasn't it. Then he said it was an issue with "noise" in the neighborhood, so he put some kind of filter on our lines outside. That made it better (did not completely fix it) for about two hours and then it got bad again after he left. So I had another technician come out, and he swapped out my X1 box made by Pace for one made by Arris. This made the problem ever so slightly better, and then sure enough, within an hour of him leaving it got badly out of sync again. He had tried telling me it was an HDMI issue, but I did not have this problem with the previous Comcast boxes with the same cables, so that's obviously not the case (I've also tried using different brands, shorter lengths, and lower AWG, and it still does this). The problem is still there when I use Comcast's HDMI chord to a different TV. Clearly this is an issue, Comcast. Please fix this because it is not fair to customers to charge them a full amount and not give full service. Not to mention, I have issues where the DVR won't pick back up in the same spot of a recording that it left off at. Also, the lag between changing channels is ridiculously slow! And channels freeze and get pixelated. I'm tempted to go back to the old Comcast boxes because we never had a problem with those.
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