I have an octopus 5000INT and the pump keeps cycling between sucking air and not...hard to explain, but it almost.sounds like the impeller is wobbling inside the pump. I replaced the pump thinking it was dying and now the new pump is doing the same thing. Driving me crazy as you can hear the hum of the pump, then the chug chug hummmm chug chug hummm throughout my house. Any help?

