Just purchased a 2012 M37x a month ago. First three weeks no issues. Third week, noticed a shudder/rumble coming from front when turning slowly at very slow speeds (e.g. in parking garage or turning into a driveway). Steering is not locked. Any thoughts? Dealer service rep dismissed as normal and related to x drive. I asked for a mechanic to accompany me on a short test drive. Mechanic heard the noise and also said normal but related to electronics governing hydraulic pump assisting power steering. Also said M35 was much worse. I tend to disbelieve both. The car did not make this noise for the first three weeks. Any thoughts?

