car has been great, I've owned it for 7 years now. recently the dashboard light came on "Alternator not charging battery". I have all my service done by the Audi dealer only and now I'll have to bring it in for the 5th time for this only issue. Dealer visits: 1 - replaced battery, 2 - radiator fan control module changed (claimed to drain the battery), 3 - alternator replaced, 4 - defective alternator - replaced again, 5 - dropping the car off tomorrow. Has anyone ever had this issue and if so, what is really causing the problem?