How to stop the Pool Cleaner moving in circles?

“Possible reasons and corrective actions: Remove dirt from moving parts. Clean filter bag/basket/cartridge. Remove debris stuck in the impeller-house or impeller-cover. Place the power supply in a position so that the Pool Cleaner can reach all walls. Lock the bottom lid in the right position. Correct pool and water conditions. Refer to the pool cleaner manual on the product page.”