Is this a LS-Quad or the Qute leveling unit? In either case it could be faulty reed sensors. I have seen on the LS-quad which uses and optical sensor for leveling, the IR leds get weak over time. If the car is near the very bottom or at the extreme top you can have problems. The tape gets tighter towards the bottom or top much like a guitar string so even relatively good tape guides can seem not good enough. If it is a Quad you can also make sure that little mirror on the back of the leveling unit plate is very clean.