MoHarleyRider,
You may have a pinched handle bar control, especially if you have chrome housings on the controls. There are a lot of wires in very little space. Your Audio functions share a common wire of pink/White. Audio (+) is Green/blue, Audio (-) is grey/green, Audio (IN) is brown/black. I suspect one of these lines.
When the problem occurs, you can put the radio into diagnositic mode by pressing any 2 buttons on the front of the radio while turning the bike to ignition or accesory. You should see five ones in the upper display; I'm guessing that you will see a zero in one of the bits. Unfortunately, this data is not historical so it only works when the problem occurs. Good Luck! [smiley=1syellow1.gif]