I see someone has told you already how you have to clean out the lint. This is usually the problem when my sewing machine starts to
"act up". Everyone should unscrew all the little screws, etc and remove the face plate, and take out what will come out, bobbin,
etc. and use a cleaning brush, which is long and can reach even
under things, and clean out all the lint, maybe about every two or three weeks. Well, if you're using a material that sheds a lot, even more often. Like fleece.