I was working on a donation quilt today. As I was sewing I thought the machine sounded funny. Then I turned over what I was working on and the bobbin thread was just laying on the back, barely caught. I rethreaded my machine and bobbin and it did the same thing. So I pulled out the bobbin case, thinking there might be a thread caught. We what did I see, Lots, and Lots of fuzz. It has not been that long since I cleaned it. But I have been sewing alot lately. Lesson Learned. Clean more often.