I've got the package III with nav and jbl and the audio isn't working. The Bluetooth, nav, and associated voices work, but the audio for xm/sat/aux/ect doesn't. In the morning the audio works then jarbles in and out. Then no audio. Seems like there's an amp overheating. Anyone have ideas as how to repair/fix? I prefer not got spend $4k like another post I saw here on pc.