Small Appliance Repair Questions? Ask a Technician ASAP
Make sure that the needle size is correct for the material you are sewing and also for the thread you are using.
Try using a new needle, and adjust the tension.
Make sure you have the thread path correct, and that the needle is inserted fully in the correct direction.
Let me know if the problem happens with all fabrics, or just some.
I am a user of this site just like you so for any payment queries you will need to contact customer services, however I understand that your deposit for this question remains in your JustAnswer account as I have not been paid.
Have a good weekend!