Strange behaviour when WheelColliders are on their side.

I am currently doing some tests with WheelColliders and have made a basic driving script which works as expected. The problem occurs when I flip the car; when on its side, the car starts gyrating and flipping wildly. I believe that the problem lies in the WheelColliders because when they are removed, the car behaves as expected on its side. I further tested this by moving one of the WheelColliders outward; this resulted in even wilder behaviour.