I have 3 fun sonic turbines and one of have same problem it's two thinks you should try one the magnet inside the front nut is no good or weak ,,I did replaced my ,,with small earth magnet must be installed sideways or try to mauve the sensor closer possible to center ,try to place metal object to the front nut and see if the magnet is strong ,I think you should be able to order one from jetjoe if is to hard to replace for you and check the wires connection.and if you looking for parts I have some to.