I had this a few months back Audi did it. tired to blame it on my gopro being plugged into the fag socket. told them to stop being ridiculous and accept it under warranty they did it and came back with it was a wiring fault
Just an update on the problem with my head light.
Took it in yesterday for the xenon to be changed,which IS covered under warranty,and still didnt work.had to have the whole head light swapped.all sorted and working again now.great service from nottingham audi.