HP 9040 MFP copy problem

[mattmarv]

When the customer copies from the ADF ass'y, the copy of the origonal is always dead on the same. But when they make a copy of that copy then copy of the copy, and so on, the print shifts slightly and by copy 5 or 6 the print has shifted enough to run off the page.
Tray registration has been done for each tray and scanner calibration has been done also. Any ideas.

laserworks-canada.com