Mohawk, how big is your pool? If your pool is really big, it might take more than 2 hrs. to clean. Are you using the "fine" bag or the "mesh" bag? Are you giving it enough time to reach the other side of the pool before it reverses? Do you have the pin all the way down in the hole? Those are the only things I can think of that might make a difference. Let me know how it goes.