my car had the same problems.. straight from pickup. they kept telling me everything was normal. but as u can see from my post and video it was not normal:
http://www.f30post.com/forums/showthread.php?t=858439
they finally took apart the front bumper and cleaned all the sensors properly. they said there was some sort of waxy or greasy build up around the sensors. after they cleaned the sensors out properly and re-assembled the whole thing the problem went away. i'm not sure if the build-up was from delivery with them waxing the car or some sort of left-over manufacturing wax/grease from the factory