Phaser 6120 has started printing 1"-3" down from the top of the page. Blank for about 2", then the document starts printing. Sometimes (not always) there is a smudgy line at the top of the page. It then shows error "Paper Jam Transfer" or "Paper Size Mismatch". 8.5 x 11 letter size paper in tray (no duplex unit). This is happening on both the Configuration page when first turned on, and on any document sent to the printer. This is an old unit, but still prints good color.