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Look very closely at your sample stitching and determine which thread (top or bobbin) is looping and which is breaking. That will narrow down where the problem exists.
A top thread that loops and makes thread "barfs" under the fabric is generally an upper thread tension problem.
Try: Remove the top thread. ALWAYS RAISE the presser foot and rethread from the beginning. Set the upper tension to the midway point (probably will need to tweak this tension depending on your machine).
Have you tried loosening the upper tension? Remove the upper thread, RAISE the presser foot and rethread from the beginning (make sure it follows the correct thread pathway). Sometimes the upper thread jumps out of a thread guide or wraps around something. Or try a different brand of thread? Avoid old or bargain bin threads--use good quality thread. Could also be the incorrect needle for the thread/fabric, ie thread too large for the needle eye.
Be sure to RAISE the presser foot BEFORE threading the upper thread. This releases the tension disk so the thread can seat properly. If upper thread is breaking soon after beginning to sew, it usually is because the upper tension is too tight. Try loosening it and re-testing. The upper and lower threads should meet in the middle of the fabric.
Check the spindle the thread is mounted on and see if it\'s wrapped around it. Sometimes thread will catch and wrap around the spool spindle and break.
Check thread guides to be sure there are no nicks that might be catching the thread or damaging it.
Replace the needle.. a burr in the eye can cause upper thread to break. Needles should be replaced often, modern fibres can be hard on them, they get dull and that\'s no help for anything either.
Make sure the thread spool is mounted on the spindle with the thread coming off as directed in the manual. Some machines only work when the thread feeds in the right direction from the spool.
It can also be a tension issue.. tight upper tension or tight bobbin tension. Bobbin tension may be adjustable manually, but it\'s pretty rare for it be a problem. Upper tension, I don\'t know. I\'ve yet to get into computer machines so am not familiar with how they set upper tension.
But the mechanism that produces the tension can wear out or break and need replacement.
My experiences with thread breaking with machine on a quilting frame make me look at the upper tension being set too high, the needle being worn or movement of the machine is too fast. Reduce the upper tension first, then sew in straight lines at first. See if you can sew slowly, in straight lines and reduce the upper tension until the thread stops breaking. If so, try some 1-2 inch circles, again going slowly. If the needle thread is pulling to the back, you will need to increase the upper tension again until the stitches meet in the middle of the fabric. If you can't locate a balanced spot where the needle thread is not pulling to the back side and thread doesn't break, try taking the machine off of the frame and sewing on a table. If it won't sew this way, it needs some professional help. If it does, you will probably save a lot of time taking it in for service, making sure to explain to the repair center that you have problems on a quilting frame, not while sewing normally. When the machine is adjusted to sew normally on a table and you move it to the frame, you will probably need to reduce the tension by 1-2 complete turns of the tension knob.