Two weeks ago I posted about a major problem with both audio and video dropouts. 10 days ago Cox came out, measures the signal strength and found it too high. They adjusted the signal down. Since then, I have had almost no problems ... a very occasional less than 1 second blip maybe 2-3 times in the last 10 days. I also see this on my set with a QAM tuner and no box so I think it's a network or cable feed issue, not the dvr box. No more complete audio drops where I had to rewind the dvr to get audio back.
If you are having problems with dropouts or tiling, it is worth a call and insist they come out and check signal strength. It must be within a specific range, like baby bear's porridge, not too low, not too high, just right.
Also, ask for a Cox employee, don't accept a contractor. I had a contractor the first visit and he refused to check signal strength even though that's what the person at tech support told me they wanted. All he wanted to do is change the box and get out. If he did what he was told, it would have eliminated 3 box exchanges, a second tech visit, and a weeks worth of frustration on my part.