I've got a Kenwood electric mixer I've used for...

Question

I've got a Kenwood electric mixer I've used for years primarily to make bread dough. This past week while using it the mixing bowl started to rotate and come out of its base. Never happened before. I figured that the dough hook had to be turning now in reverse! This pushes the dough against the bowl side in the direction away from the stop in the base. Pushing against the stop keeps the bowl from moving. Can someone help?