I have an *old* Sat-B55 that has been used mostly for music as part of a home audio installation. Lately though, I've noticed it can't get certain DMX (Sonic Tap) channels. Zen (857), Dance (859) and Light Classical (866) for instance, give me nothing but "Searching for satellite signal..." messages. Most of the other music channels work however. And my HD receivers get the channels just fine. I've rebooted and reactivated the Sat-B55 multiple times. Is my receiver simply too out of date tech-wise to get those channels? thanks!