I have had the very same problem! Only I broke two. My Baby Lock and my Juki walking foot. I decided it was that I was pulling on my fabric instead of guiding it when I was FMQ. I priced them and they were so expensive that I haven't replaced them. I have taught myself to FMQ in the ditch and I think it is easier than with the walking foot. Will be watching your thread to see what others have to say.