I had to replace the spider gasket for my Hayward Dreamline sand filter last year because it would get stuck and the backwash would stay open. After I put the new one in all was fine. So, fast forward to this season....I'm 2 weeks in and the new gasket is acting up; the backwash gets stuck on open (not full force, but enough to quickly suck the water out of the pool). I've ordered not only a new gasket this time but the housing it sits in (it comes pre-glued). I lubricated the gaskets each time. Am I missing something? Anyone else have this problem?