My radio on my 2006 a6 is stuck on mute. i have tried resetting the MMI which does not help. when i pull the key, i get static over the sound system. any ideas?

SOURCE: How do you turn the sound on if mute is on MMI sound system?

Depress the volume bottom or rotate the volume knob. When on a Bluetooth phone call, the speaker symbol will mute, but unmute when the call ends. Either rolling the right steering wheel scroll or the volume button on the shifter area will should unmute the radio volume.

SOURCE: 06 A6 MMI radio switches on and off every few seconds. Bluetooth

Your most (fiber optic) system is inoperative. Its most likely your CD player and the bluetooth is an update issue, if it doesn't take the update then you need to replace your telephone transceiver.

SOURCE: Hi my MMI system on 2004 A6 asgone dead, no power

No solution, same problem, but had many strange moments: 4 months ago during 100 kms or so it stopped, then suddenly came back, and worked ever since. A few days ago, it started happening again: NAV stuck, then radio dead, and gradually the rest disappeared. I did a Reset, and since that moment I see the intro-screen and then it goes black. Hitting the TEL button is somehow also a Reset...

Do the previous 2 posters have anything to report on this matter? It would be VERY welcome!

Thanks,
Jeff