I did notice that on the SUBX1 if I push the radio's buttons hard enough, the radio turns off and turns back on again. It could be one of those "that's what I get for a $10 radio" thing.
Now I wish I really didn't go back behind the car's built-in OEM radio with the Sirius antenna wire...getting that out could be a PITA. (I'd have my mechanic do it, but the one guy went off the map and the other guy is semi-retired and he sold the shop!)
I may try swapping the dock first. It's not like I don't have 30 of them laying around from previous radios.