I bought an fx5 filter used about a year ago. When I first set it up it ran well, but the motor was louder then expected and had a whine to it. Cleaned the filter and reassembled it numerous times and it wouldn't go away. Finally I broke out the tools and removed the motor assembly cleaned that and that solved the problem. Now every time I clean the filter the noise comes back and every time I need to remove the motor. Needless to say this is getting old and to make matters worse I am stripping some of the screws. Any one have any suggestions? I don't know if sand is getting stuck in there or what. Right now I am listing to the whine and it is annoying and I won't be able to take it apart until Saturday. Otherwise, it is running and well and the motor assembly does not feel warm to the touch or anything like that. thanks for looking