I threw my Tigershark in this morning to clean up the pool after I changed the rubbery brushes because it was sliding down the walls, I could see the impeller kick in from the water movement. Then it stops. Normally, it would start moving almost right away. Today, it just sat there. I pulled it out, removed the filters, I threw it back in the pool, but it did same thing, ran for 3 sec, then stopped. No clogs, or debris. It did the same thing every time i re-powered. The cleaner is only 2 seasons old with minimal use. I only use it once a week as I have very little debris. Any suggestions to remedy this would be greatly appreciated.