First of all your printer has a vertical paper tray which is not the best for paper handling. Make sure your guides on the side of the tray are set snug against the paper. If none of that helps you most likely have pickup and feed rollers or paper separation mechanism not performing perfectly. Cleaning these rollers helps a majority of the time. These rollers can collect lots of paper dust especially when using low quality paper. Just to add, try different brand of paper, a good quality brand. Clean the rollers will a good rubber cleaner that doesn't leave any residue. I would like to recommend one to you, but it may not be easily available to you. Do not use alcohol as it will dry out the rollers causing them to crack and brittle.