Greetings! I come bearing good news!
Both my sister and I have had this problem with our Janome 6500 and doing freemotion quilting. So I thought there might be more of you out there!
Often when quilting, the bobbin thread would stop feeding and I'd have to stop quilting, raise the needle and yank on the quilt to get it freed.
I just about lost my sanity last night while doing a baby quilt so today when it happened again. I crawled under the quilt with a flashlight and realized that the bobbin thread is catching on the lowered feed dogs...true story! So I took off the needle plate and put a small piece of masking tape over the feed dogs. The needle will pierce the tape and make its own hole as you quilt but I didn't have one CATCH! And I used two full bobbins of thread doing free motion. Last night I stopped counting at ten!!!
BUGS the heck out of me that I paid 2000.00 for a machine that won't free motion quilt without masking tape, but that's life!
Lori