Pull some thread and see how easy it breaks by hand.
What is the project and what size needle are you using now?
Another recommendation to change the needle. Can you check the upper tension and threading? There could be small pieces of thread caught inside. Check the bobbin area also for stray pieces of thread.
Re-thread top and bobbin threads. There can be combination of issues. I usually start over with a whole re-thread including new needle. Needles can be bad out of the package.
Good Luck!
Last edited by Rhonda K; 11-07-2017 at 06:15 AM.