I used the spa for the first time in months & now the water runs back into the pool when the pump is not running. I replaced the flapper in the check valve & it is draining out slower but it still won't hold. One odd thing I noticed is that after I replaced the flapper the spa only filled to a certain point & then stopped. I hit the button to put it in spa fill mode & I noticed that when switching back to pool mode the handle on one of the jandy actuators made 2 revolutions before coming to rest. Could this be failing?