Scanning about 200 pages in. It works fine for the first few times then it may get to page 150 then error out. Scan again and it will get to page 145 then error out. Third time gets to page 120 then errors out. Keeps going down. Cycle power and it works for a while again. Have 7 machines doing the same thing. not all in the same location. Thinking HDD??? Any other suggestions??