Thanks for your suggestions. I gave up and took it back to the shop again. They were very sympathetic and sent it back to corporate again. Just picked it up night before last. When I took it to the shop, they asked me to show them what it did. It broke 3 needles right there on the sales floor. The note that came back with it seemed to indicate that they had replaced everything down in the bobbin area. I teach 6th grade science and this is the second week of school. No time to sew until this weekend. Going to AQS Nashville show 23 & 24 on a personal day from school. I am a little reluctant to even try again for fear it will still be messed up. We tried 3 sizes of 3 types of needles and 4 types of thread with each one. It free motions about 2 to 3 minutes and then starts yanking the thread down in the bobbin. We'll see this weekend. I am grading papers tonight and took a break to see who had read my post. Thanks again. I'll try to get back on this Sunday pm.