I recently purchased a Janome1600P. I recently purchased a Janome1600P DB machine. I have it on

Question

I recently purchased a Janome1600P DB machine. I have it on my Grace quilting frame and am in the process of quilting. However, the thread keeps breaking. I have made sure the darning foot is adjusted correctly, the thread is threaded correctly and that I have the right needle in. What else could be causing this. I free motion most of my quilts and haven't experienced this before. Help!