So did you check the solenoid??
I ran into this same problem and determined that the feed roller wasnt lifting off the paper and was causing the next page to "pre load" to the sep roller in the tray. When the next print job or page was was started the sep roller was pinching the paper down and not allowing the paper to get past the tray. Turned out to be a spring on the paper shaft mentioned and pictured earlier had come off somehow and was jammed under the primary roller shaft not allowing the feed unit to retract far enough to stop feeding the paper. I know this post is old but hopefully this will help someone in the future.
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