Anyone know of any problems with 2005 Audi S4 convertible?

My friend has one, he is “happy” that he has leased one, but can’t wait until it is over. Has mad many issues with electrical stuff and interior noise. Has been towed back to the dealer for breaking down. It had been the ignition system. He is not mechanically inclined so I won’t know the details of most of his problems. They have fixed his problems under the warranty, but for that payment and being stuck on the hwy twice, let just say he won’t buy an Audi for a while. Now this is an N of 1, so maybe he got a lemon.