I recently installed my D3 and have had this problem occur twice. It seems that when listening to XM the audio will break up kind of like when the signal is fading in and out then no audio at all. The display is fine. It shows the change, logo, song and artist just no audio. During this time I can change to FM or CD and they have audio.
What I did both times was to stop and turn the car off then back on and everything was fine. What I didn't do was to turn off the radio then power it back on without turning off the car. Will do that the next time. Any ideas on why this is happening? Thanks.