Document Feed scans are scrambled

I've had my MF731C for about 6 weeks. For the first 3 weeks, everything worked fine. Then when I scan with the doc feeder, I get a totally scrambled image. Flatbed works fine, firmware is up to date, printer is fine. Even tried using the feed scanner with other computers and got same result. Nothing changed other than the results of the scanner... Please help. Screen shot below....