Googling shows others with a similar issue, but the difference is... they get this error right away, when starting a print job. For me, it happens in the middle of a normal successful print job. In other words, I can print 20 copies of the same doc, the first 11 print fine, and the 12th gives this error.
Popping the paper tray will make it keep printing, but I hate to babysit it.
Any guesses what it might be? Paper is set up correctly both in PC document and in printer - standard 8.5 x 11 letter. Seems to happen more often with double sided printing. Seems to happen less if I keep the paper tray brimming full. Some guide or sensor getting gradually borked? Overheating? Happens with multiple documents from different PCs. Happens with both simple 1-page text-only documents and complex PDFs with graphics. Might go all day without the error, or 5 times in 5 minutes.
