I just got xfinity tv a few weeks ago and ever since the main tv in the living room has the audio periodically cut out for 1-2 seconds every few minutes. I don't think it is an internet/streaming issue because if you rewind it, the audio is there and it will play. I also noticed that i am only having this problem on the main tv where it the main X1 box is and we have an LG Sound Bar - which we do not have on our other tvs. If i had to guess it seems like an issue with the x1 interacting with the sound bar.
I've got the sound bar connected and its controlled through the xfinity remote and it works totally find except for these intermittent audio drops. I've already went through the troubleshooting "reset" your tv box and that hasn't seemed to help. Any advice???