Underbody Shield problems of the 2000 BMW 328

: the contact stated while driving 35mph there was a noise from the rear of the vehicle that vibrated throughout. The noise became more common at all speeds and while driving in general. The vehicle was taken to an independent repair shop. The mechanic inspected the vehicle and discovered the sub frame separated from the body along the rear of the vehicle. There were no previous crashes or damage to cause the separation. The vehicle was also inspected by an authorized dealership, but no repairs were made.