when scanning the document feeder will pull the 8.5 x 11 paper into the feeder and then stop about 4 inches into the scan. then will continue making separate pages of a single page scan. I have reinstalled the software, followed the power done procedure but still does it intermittently as before. it may scan 20 pages fine then have this error for one page and scan 10 more fine. document feeder has run nearly 90,000 pages.