When I make copies on the printer from the document feeder, the copy has grey boxes that weren't on the original document. The example below was generated by making a copy of a blank sheet of paper. The number, size and darkness of the boxes varies from copy to copy.
Printing a document from my computer works fine. Scanning a document to my computer gives a normal scan. If I have no original document and hit the copy button, I get a blank sheet of paper. If I scan a document from the flat bed, I don't see the unexpected boxes.