Starting yesterday on my HR21-100, the audio started going out during local network commercial breaks (which wa not a bad thing) and then coming right back on when the show was re-joined. This was happening on multiple channels. This morning, it is happening on most of the channels full time. The only channel coming in during the actual program is channel 4/392 in NY, ESPN, SPEED, and a few others...only during the actual shows... I already rebooted the HR21, made sure my Yamaha receiver worked with other items plugged into it, etc. Is this happening to anyone else? Any ideas?