I bought a used Juki TL-98Q on the a Grace GMQ Pro frame about a year ago. Unfortunately, I've never gotten the machine to work correctly. I've had it serviced, but it still has the same problems. (Too long ago to take it back and have no receipt.) If the thread is not breaking on top, it's clumping on the bottom. I've taken it off the frame and used it as a regular sewing machine, but I have the same problems. (I wasn't sure if it was a problem with the machine or the quilt/frame.) I'm about ready to give up, but I see that nearly everyone here that has this machine loves it. I love it too, until I feed a new piece of fabric in and it clumps/breaks the thread. Any ideas?