recently purchased used. likes to stay more in one end of pool and at times does not clean entire floor. is it permitted to guide the robot to the missed area by pulling it by the power cable or will that confuse the robot. ADMIN REPLY: Sure, direct it with a tug or skimmer. Be better to figure why. Maybe the bag needs replacing...run the robot without one. Maybe one of the wheels is binding, the bearings could be bad on one of them.