I have noticed on mine if I sew too fast the thread will come up out of the first notch at the top, and get tangled. Someone else had placed a small washer up there held between the faceplate and the body of the machine. I’m not a very fast sewist so I haven’t tried the washer, but next time your acts up see if the thread is out of the notch. It’s figure A in the drawing in my last post.