The Resume switch on my hydro handle quit working today. Now when I press resume to lift the head it goes all the way up. I can reset it and it will work once then it starts to raise the head all the way up again. Sometimes when I try to set it when I let it all the way down and press the 1 then raise to the height I want and press the 2 it drops to the ground. Any ideas? It works fine lowering the head. It just will not stop at the preset height.