|Daveincaps post is most likely the correct answer, dirty rollers can cause irrational sheet feeds. If the rollers are dirty with paper dust, try cleaning them with a moistened coffee filter. Coffee filters are very porous and will collect paper dust. This is actually recommended by Xerox for cleaning printer rollers.|
However with the cold weather have been experiencing in the U.S., static electricity can also be a problem.
Take the paper out of the tray and fan it out a little bit in a more humid environment. If your environment is very low in humidity, try a humidifier or take a spray bottle and add a little moisture to the air, even spray the paper very lightly (very lightly) with mist.
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