Guys, recently bought a house with a pool and it came with the Polaris 380 vacuum, it kept getting stuck on the stairs and I established that the backup valve was bad. Since then I replaced the valve but the vacuum keeps getting stuck..... One thing I noticed it is able to backup while the solar cover is off but when the cable is under the cover, it apparently restricts it from properly pulling the vacuum behind it. Is this something that is common and is there a way to fix this problem ? Maybe adjusting the floaters or will I simply have to cut the hose to make it short enough not to reach the stairs, in which case it would miss cleaning quite a bit of pool surface. Also my valve seems to slowly increase in force when pumping water untill it reaches full speed, the guys at zodiac said it should start pumping full force immediately. Is it possible the new one is bad too ? however I dont see how it would help as it pumps water at full speed for quite a bit and the vacuum doesnt really move at all, maybe 6 inches is all and then just comes back to hit the wall when backup cycle is done.