Mine has been going on/off since I've had the car. Twice paid $47 to replace bulb. They stated, that incandescent bulbs are not covered by the "bumper to bumper" warranty. I looked and that is what the manual said. Then they tightened the connections blah, blah, blah.
Got tired of it. According to my lemon law attorneys, the entire wire harness needs to be replaced, which involves completely removing the interior of the car, which Audi is not inclined to do. So I am trying to get Audi to give me a replacement vehicle. I mean there was this problem and others.
Apparently this is a cabriolet only issue.
2005 A4 3.0 Cabriolet
Morro Blue w/Gray Leather
Bose Sound System w/XM Sat service