  My Audi is less than 6 months old, it has 4200 miles on it. Twice in three weeks it refused to start using the "Smart Key" Feature. I tried to use the traditional key instead. Not only did that not work as well, but the car refused to let me retrieve the key. The Audi also froze in Park, and the power would not go off. By the time it was towed to the service center, the battery was dead. It was in the shop for 6 days the first time, it's been in for 7 days now for the second time. The service center still can not find out what's wrong with it. They did give me a nice loaner, however.