 The dealership is excellent and does its best, but my car had a battery drain problem that left me stranded in airport parking lots several times after long trips from Europe and Asia.  After many interventions and, as long as a week at the dealership at a time, to check it out, they changed the battery.  I suspect once the battery gets old it will discharge again but I only have a few months left on the lease.  The car also has had small problems that should not appear on a 55K plus car.