Hi 

New to forum A3 2013 

No sound comes from speakers Radio /Phone/Nav most of the time then comes on then goes again checked wiring connections on MMI no success any help before seeking Audio engineer. 

A car audio specialist is probably your best source of help.

Think so our usual Audi specialist not interested in looking. 

Id suspect the amp at fault.  As it'd be unusual for two speakers to fail at the same time. But this should come up as a fault with a diagnostic check 

Hi Steve thank you for replying done diagnostics didn't show that fault will see auto electrician. 

4 hours ago, Copley said:

Hi Steve thank you for replying done diagnostics didn't show that fault will see auto electrician. 

Please keep us posted on how you get on 

Hi , did you get this sorted. I had this issue a few of years ago with intermittently losing all sound to eventually no sound except on frosty mornings. Sent my MMI to a third party e-bay repair service and it was repaired and returned back in the car in 72 hrs. Just search Audi MMI no sound repair and you should get a few listings up. I think the cost for me was £175.00 about 3 years ago and had no problems since.

Hi Martin still have problem it works infrequently.