I have had a very intermittant problem (once every 2-3 weeks) with the volume of my PCM1. When listening to music, it seems like the sound cuts out when the Nav unit's CD(not the changer) drive is searching. Sometimes, it only takes a minute to sometimes 5 minutes to hear music again. Also this never happens when I try to actively use the Nav to go somewhere. Last time this happened, I adjusted the volume setting (not volume ****)for the Nav voice, and the music came right back on right away. Any ideas?