I recently had trouble with the thread breaking. So I rethreaded everything changed the bobbin and needle.It was fine so I put the spool of thread back same thing the thread was breaking about every 10-15 stiches. Changed thread again and it worked. turned out it was a bad spool of thread it had little nubs like every few inches very tiny nubs. but when I ran it through my fingers I could barely feel it. Just letting you know it could be something in the manufacturing and not you or the machine. Mary