I have noticed a minor irritation with my 722K. If I tune to one of the Sirius channels, the 722K will not respond to my remote. No matter what button I push on the remote, the tuner does not respond. If I get up and open the front panel and push the menu button and bring up the menu screen, I can then press the guide button on the remote and bring up the guide to tune to another channel. I have tried changing the Remote Address but, that had no effect. Replaced batteries in the remote, no effect. And, it only occurs when tuned to a Sirius or Music channel. Any ideas or suggestions besides getting a replacement 722K?