Canon DR-2050C Path-Through Scanner "folds stapling" Questions

...the pages: sometimes it succeeds. Document lengths vary from 3 to 30 pages. No staples, holes or folds. History indicates 6,000 prior scans. If the scanner is scanning but stops after a few pages ...

...the internal finisher that resides in the center of the machine: open the slotted front cover, it folds down towards the ground, then push the green lever sideways to slide the finisher out to the ...