I have a Watertech Blue Pearl robot pool cleaner that constantly gets stuck on the steps. I will not reverse itself. I have made sure that entire power hose is in the water and even removed the pool ladder to make sure that the power cable will not get caught. When I reversed the handle (per the manual), the cleaner will run all along the walls of the pool at the water surface. I have no clue how to cure this problem. It used to work just fine and do an amazing job of cleaning everything. Any help would be greatly appreciated.