The suction of your pool cleaner is too low. Increase the setting and this should rectify the problem. If the problem persists, check that your filtration system is in good order and that there are no leaks. If you see bubbles coming out of your aimflow, or if the water level drops in your weir when you plug in your pool cleaner, you have a leak. Get in touch with us and we can help fix your leak in no time.