I have a 4100N on the network that's being a major pain in the posterior. Periodically when a print job comes to the computer it will give an unexpected paper size error. The correct dimensions are set on the excel or word document from the sending computer for letter size paper, the tray on the printer is set for letter size paper(recognized by the printer as well) but when the unit prepares to print it sees the incoming document as legal size and goes offline with the unexpected paper size error. if you hit go the printer will ask if you want to print the document on letter size paper that is loaded in the tray. If you hit go again, the document will print, however the printer will not return to a ready state. At this point you have to go to the resets menu, reset to the original configuration then turn the printer off. When the printer is turned back on, it initializes the returns to ready state and will print normal until the error occurs again. Aside from checking the sending computers print parameters, the only other thing I've done at this point, other than resetting the printer to original configuration, is to change the paper tray. Any ideas?