My Canon i860 has developed a new quirk. It tells me that it's out of paper when there's paper loaded. If I push it will say paper is jammed. If I push enough the paper will go partially in, back partially out, do that once or twice then start printing. I don't recall it having problems the last time I used it, maybe a month ago. I couldn't find anything in the manual dealing with paper-feeder problems. Can anyone offer help?