I am having sound issues on my 722 on the NY HD feeds of CBS and NBC. There is no sound on some programming and some commercials when mys Audio Receiver is set to Dolby Digital. I do get sound if I switch to 7 channel Stereo. On other channels, if the transmission is not DD, the receiver automatically switches to Dolby Pro Logic. The problem seems to be on programming that is not Dolby 5.1 (daytime shows and most news shows). This has been going on for about 3 weeks and Dish has not fixed the problem. I call to get an update every couple of days. Any one else having this problem?