My story exactly. My Juki was sewing a few good stitches, then a long,long stitch. I have stitch regulator and wondered if it was going bad--kept changing the desired stitch and ripping out. Walked away for days, changed needle,thread several times to no avail. Struggled to get the quilt off the frame (it will be my "ugly nap-under quilt"). Haven't been back to start another but plan to baste a sandwich today and see what happens. So frustrating and the rip out makes me want to rant. Hope you fixed yours!