Originally Posted by
quilt addict
If the above doesn't fix your problem. Have your broken a needle lately. Maybe you have a burr somewhere, either on the needle plate, bobbin case or the hook. Just take some thread and run it across like dental floss and see if it catches or snags on anything. If so you can smooth that off with some very fine rasp or sand paper.
Similar to what I was going to suggest....run some dental floss through your upper thread path to make sure there are no little wisps of thread caught in there as well. I think waxed is recommended for this???? And take a magnifying glass to the bobbin area. Had a friend's machine misbehaving VERY badly. A teeny tiny bit of thread in the bobbin was the culprit. Once picked out with tweezers...running perfectly again.