Small Appliance Repair Questions? Ask a Technician ASAP
If you haven't already done so, check for a buildup of lint in the bobbin casing, which may be causing a jam. Clean it out if it hasn't been done in a while.
Also, if the needle is not inserted all the way, it can break while you sew because it goes down too deep into the bobbin case. So make sure the needle is fully inserted and always held tightly in place.