Recurring intermittent problem with driver side mirror that started while vehicle under warranty. As with the previous time vehicle brought in, the defect failed to appear. I was told that Detroit was contacted and this defect has appeared in only one other vehicle of its type. I believe that the service department did all it could to track this down. So far it is performing as it should. We shall see what happens in the future. Since this defect had been ���fixed��� twice under warranty I was not charged. Thank you for the genuine effort. Since no material change was done other than check out and reprogramming, the problem probably only went into hiding. hopefully not!