Welcome to the Quilting Board!
moving the sandwich to fast which is normal for a newbie to FMQ, ask me how many I broke before I realized that
Brother XL-3500i, SQ-9050, Dreamweaver XE6200D
Thank you everyone for the amazing tips. I will try all next time and hopefully save some £!!
I had the same thing happen to me on my quilter. If your thread is fraying when it happens there may be a nick in the whole in your plate try to smooth it out with a little bit of sand paper. It worked for me