Clock Trouble

We got a wall type Regulator clock from Bill's parents and it looks very nice in our family room. There is a problem with the clock though. For some reason it doesn't stay wound the way it should. It is very scary to wind too. As you wind the clock it sometimes can spin the key right out of your hand if you aren't watchful. I think that the clock may have been over wound at some point. I would like to find someone to fix it so it works properly.