NHTSA Complaint #11516246 — 2015 AUDI Q3

I was driving and the car went out of control. I had the steering wheel straight, but the rear end started to fishtail in and out of the oncoming lane of traffic. As this happened I had to quickly jerk the steering wheel to get it out of the other lane of oncoming traffic. I had to slow down to 10 mph to get home with the flashers on, all the while it continued to swerve both left and right on it's own. We had the vehicle towed to the Audi dealership (Mohegan Lake Audi) and they said the rear control arms cracked. They say it rusted through causing it to crack. It has not been inspected by anyone else. No warning lights or other indication this would happen. It simply went from normal in-control driving to a car that drove uncontrolled. I have an open case with Audi USA on this matter as Peter (Service Operations) at the dealership said this happens often to the control arms and refused to assist us in any other manner.