I also have the audio dropouts and have since at least December 2013. Despite multiple service calls and escalating the issue it was never resolved. I worked with them for a number of weeks before they gave up and said they would keep researching it at their end. They were supposed to check in with me occasionally but I never heard from them again. Originally it was just on the Family room tv when we had the older boxes in the bedrooms (rng150? Had its own tuner). When they swapped them for the Xi3 I now also have the audio skips on my bedroom tv as well. Both TVs are Samsung connected directly with hdmi. Family room tv is Samsung UN55ES8000. I used to have a Pace DVR in the family room but one of the first changes was swapping it for my current Arris AX013ANM.
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