I have a D1 and started FMQ and kept breaking needles. Thought whoa this can't go on. When all else fails, read the manual! I dragged that huge thing out to troubleshoot. When I set it on quilting FM, it told me which needle and thread to use which I wasn't doing correctly. Changed every thing the way the book said and It has worked fine ever since. Some time it just the thread, too, My machine knows more that I do....
Good luck with cleasn