Anyone else had issues with the four wheel The Pool Cleaner or The Aquanaut 400 tipping over? Per the trouble shooting guide I've adjusted the weights, legthend hose she keeps tipping over and then runs for up to 10 minutes on her side, a wall or something knocks her right side-up, then she'll run over the drain and it will tip her over again. I've also calibrated it to the proper RPM per manual. I'm at my wits end with this thing. Anyone else had similar experience?