Got Sirius Radio installed when I purchased my Prius. After 20-30 days the button for switching to the SAT channels no longer worked. It just stayed on AM. The satillite dish still shows up on the display. Took the car in and the dealer did something to fix it. It's been about 14 days and now I have the same problem again.

Anybody got a clue on what's causing the radio to fail?