For most of my HD Channels, my audio will go out once or twice an hour for about a second or two, I call Comcast, and they don't know what to do, except the usual unplug my Cable Box routine and let it reset crap. I may just go get new HD/DVR Box and see if thats the problem.
I have exactly the same problem in Napa, CA. Have you had any success in resolving the problem since you posted originally?
