When the booster pump shuts off and the Polaris stops, the rear wheels lift up at a 45-degree angle and the tail sticks straight up with the scrubber sticking out of the water. This has occurred for the last several days. Is it trying to tell me something? It's also started riding on its side from time to time even though the head float has no water in it. I could fix it if I knew what was wrong. Any advice???