Over time the paper dust causes the feed rollers to loose their tackiness to grab the paper.
What you need is a rubber revitalizer which is a blend of special cleaners and anti-oxidants to rejuvenate buna-nitrile, EPDM and other composite rubber feeder rollers. '''Kenetix Rubber Revitalizer''' is one product you could use to clean the rollers.
If you have a silicone rollers you can use a good quality of Isopropyl alcohol to wipe them down.