First, install a brand new needle. Confirm that you are using the correct needle for the thread and fabric being stitched, ie the needle eye could be too small for the thread, the fabric is coarse or sticky causing the thread to wear/fray causing breakage, the needle is blunt or bent, a ball point needle is being used on woven fabric or vice versa...
All About Needles
Second, remove the thread from the machine.
Always RAISE the presser foot and rethread from the beginning--make sure the correct thread pathway is followed (consult the manual).
Verify that the tension is not set too tight. The tension is correct when both upper and bobbin threads meet in the middle of the fabric without any puckering of the fabric.
Use good quality thread--
avoid old or bargain bin variety. And, use the same thread for the upper and bobbin. Some thread brands may work better than others in your machine. You may need to experiment to find ones that work best.
What to Do If Your Sewing Machine Is Skipping Stitches
Basic Maintenance Tension Skipped Stitches
10 reasons for skipped stitches
There is also the possibility that there is a nick or burr somewhere that is catching the thread. You can wrap your index finger with old hosiery (or similar fine fabric) and rub around the thread path, in the bobbin/hook area, needle plate, etc. A small burr can be smoothed with a fine emery board. A big burr may require replacement of the part or service by a technician.
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