 In 3 years this car has not had any big issues until recently.  Since the dealer replaced a 'recall' part of a fuel filter or pump, the car periodically does not start.  Eventually it does (I haven't had to be towed yet).  It has been in repair regularly since October and they say it is not replicating what I describe.  After several attempts at this, the dealer now has called in a 'special engineer' to work on my car.  I am now driving a low budget A4 loaner as the dealer still has my car and has not returned any of my calls.  Audi USA service is just as unresponsive and very robotic with all of their responses.  They are of no help.