I just bought a big cone of Gutermann thread and my Bernina is now sewing perfect!!! It won't work well with the small threads, but the Gutermann cones work well. Haven't had a problem since. Still can't use one of the feet. Next time I'm at the dealer's, I'll address that problem. They kinda pushed me out the door when they couldn't get my machine to accept that foot type. If they don't do something, I will call headquarters. But now, I love my machine. It was the thread all along. It just loves Gutermann cones!!!!