I was hoping someone could help me out with my P825. I start it up and it goes forward just fine but powers off once it hits the wall.....every single time. I will move it and turn it around and it does it 100% of the time. I'm wondering if there is a short in the cord from the control unit to the cleaner, but wasn't sure how to go about taking it apart to check it out. Any help would be greatly appreciated.