The past two races I have been having problem with the sound cutting out every 4 or 5 minutes. Starting with the Indy broadcasts, it is happening every few seconds, and not watchable. This morning I went to the HD broadcast on CH 209 and it does not have this problem. If you use the guide that has your favorites setup, be sure it is the 209 HD, and not the 209 standard definition that is setup(yes, there are two different CH 209's).

I'm watching on DirecTV channel 72 and haven't had a problem all day.

by any chance does this occur when you are watching live, but have pasued for a few minutes to step away or whatever, then come back and are watching using the live tv "buffer" on your DVR?