I was having lots of breakage when I did my free motion quilting. I have a Viking Quilt Designer II and the book stated that Inspira needles were best so I got my first one. They are a bit more expensive but worth every penny.
What a big difference. No more breakage. These needles have a smooth beveled entry so the thread doesn't wear and tear.
Thread I thought I'd never be able to use for quilting again is never a problem any longer.
I'd say its your needle.