Hi all,
I am new to this site but hoping I can help in case anyone else has this problem!
My A5 sound system started to cut out and then died completely. After a lot of time with the stealership and others trying to help we found that the culprit was a corroded battery cable!
I looked on lots of forums at the time and did not see this issue- hope this may help someone else not have the hassle that I had finding this out!