This has happened to me a few times when I started a route while in a garage and the GPS wasn't locked in. Once out of the garage it had me going backwards and sometimes on totally different streets. The two times it happened I reset it by turning off the ignition, locking, restarting and all was good. Not a big deal but curious if those are your symptoms. If so I might have it looked at during my first service at 10k miles. Amazingly, having had the car for 9 months now that this is the only defect! I've never had that level of quality with a USA model before.