Well, I was having the same problem, plus my machine was eating my material. I finally figured it to be the bobbin. I had the wrong kind. Some machines are very touchy, so went to my machines booklet and got the bobbins number and bought 50 from ebay for 5.00. Now all is well. I had to rewind the old bobbins on to my new ones. I have two different machines with different bobbins, so marked my brother bobbins with marker red and pfaff blue. Am giving my other bobbins to someone else. Hope this helps.