I have a 2 month old Pentair Kreepy Krauly Legend pressure side robotic pool cleaner. At first it worked great. It gradually started steering or drifting to the left, or counterclockwise. The hose attaches at mid point of the long side of a rectangular pool. The cleaner mostly stays on the left side of the pool. The hose is cut to the correct length to reach the farthest corner. I've adjusted the Thrust Jet to the right and it only helped a little. Any suggestions?