I am assuming you are quilting by using the feed dogs not just free motion quilting. I agree with the others, that it is very difficult to do quilting without any machine having a large table, or better yet, a set in cabinet to allow the quilt to move more smoothly and not get hung up on edges of things. The other thing that comes to mind is that my tech told when a machine has been used a lot, the little edges of the feed dogs themselves can become round allowing the fabric to slip around more. He said he has replaced some of the feed dogs on heavily used machines. Just a thought.