I was quilting merrily along on my quilt as you go project using the walking foot on my Bernina 1130 and the fabric just stopped moving. I've moved the feed dogs down and back up, turned the machine off and on, cleaned out the lint. I got it to stitch another few inches but it stopped working again. I turned it off to give it a rest. Any ideas of what the problem might be? There's no way I can take it to the doc so any suggestions will be greatly appreciated.