CircleCollider2D falling through edgeCollider2D when flipping?

Hi! Im making a 2D car game where the player can flip when hitting a object, but Im having trouble with my flip code. It works about 80% of time, but sometimes the car falls into the ground and gets stuck. Any ideas how to fix this or better ways to flip the car?

Here is the code i currently use to flip the car:

     public void Flip()
     {
         Vector3 theScale = transform.localScale;
         theScale.x *= -1;
         transform.localScale = theScale;
         facingLeft = !facingLeft;
 // dir is used by the wheelJoint2D motor to set direction
         dir *= -1;
 
         rb.velocity = -rb.velocity;
         motorBack.motorSpeed = -motorBack.motorSpeed;
 
         Debug.Log ("Flip!");
     }

Thank you for any advice!