Own a 2007 Audi A8 base model and notice that the radio, cd player, Navigation, etc will click off intermittently. No regular cycle for this but it happens all the time and you can hear a clicking sound from behind the rear passengers seat when it happens. The voice recognition for the MMI is also no longer active. When the cd player is interrupted, it does not reset, but rather, picks up where it left off. I am wondering if it as simple as a fuse or am I looking at having to replace one of the interface units. Your help would be greatly appreciated.