• You are showing the time steps for step 2. What happens in step 1? Is the error occurring in step 1 or step 2?

  • You show the faces for Symmetry, but not the axis direction, check that is correct.

  • You should add a second Symmetry Plane through the center in the width direction to prevent the ring from moving axially. This will probably fix the error.

  • You have a Moment load, but that is not a Symmetric load. Remove that.

  • Change to the Direct solver.