Rita, I used to have that problem all the time until I switched to Superior metallics, which now sail through my machine like butter using a large eyed embroidery or metallic needle (they are basically the same, I believe), and Bottom Line in the bobbin. I heard Marilyn Badger, a quilter who uses tons of metallic thread, say that metallics don't do well with cotton in the bobbin, and she uses a light polyester (like Bottom Line). I use a lot of metallics now. I don't like some of the other brands as much, but with everything set up right (light top tension, Bottom Line in the bobbin, large embroidery needle) they tend to work ok. Good luck.