I have a 2005 S4 (B6). On hot days when I start up my car, the radio volume fluctuates wildlyto the point I have to shut radio off. Since the air conditioner fan is blasting (hot days) I thought the problem might be the speed volume control, but my Audi menu doesn't have SVC that I can disengage. Is this an amp problem? I've had it into the dealer and the radio has been replaced but the problem remains. HELP!! I don't know how much longer I can drive with my wife as passenger without a working radio!

Hi Mike, did you ever find a solution to this problem? I am having the same issue.

have u held the menu button down for 5 seconds. I think the svc control might be in their. not 100% sure though.

Yep...have the same problem. Thought it was the SVC so I shut it off. Still does it.

Come to find out....its the Bose Amp that is causin it. Found out the wrong way. Replaced my OEM Audi Radio and still does it. Only thing left is the Bose Amp.

Bose Amp at Stealership is 640.00...

yikes.

Found out that it was the Bose Amp. Replaced Amp and ran new wires to all Bose speakers.

Man, what a difference. Works great...

Thanks for the suggestion, I wish it had worked.

I've had it into the dealer and the radio has been replaced but the problem remains. HELP!! I don't know how much longer I can drive with my wife as passenger without a working radio!

Found out that it was the Bose Amp. Replaced Amp and ran new wires to all Bose speakers.

Man, what a difference. Works great...

Thanks all for contributing to this thread. Lots to read in this forum but I like it.