I had this problem as well. Turns out there is a Technical Service Bulletin involving a leak in the rear window washer fluid line. It leaks at the rear door hinge (left) and that washer fluid runs down onto the radio stack in the Left Hand wheel-well compartment. It shorts out the system until it dries. My dealer fixed / replaced the hose at his expense. Haven't had the problem since.
Did you ever find out what the problem was? This exact issue just popped up on my 2006 A6. I see an inevitable trip to the dealership.
Check that there is no 'mute' or 'att'-button pressed on your audio system.
Other (unlikely) problem is that for some reason the speaker wires have come off.
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