Is your scanner refusing to pull one page at a time like it should be? Try cleaning the pick up, seperation, and feeding rollers. Most scanners have cleaning kits available with the necessary items. Also check to make sure your documents are being properly prepped. Proper document prep includes: removing staples and post-its, making sure the staple holes are not hanging on to each other, line up the corners of all the documents, and fanning the documents prior to scanning.
If you have done all of the above and the documents are still feeding poorly you may need to replace your rollers with are considered a consumable item. I know you can purchase all scanner comsumables from ImageSource, Inc.