Haven’t had that particular problem. However, was doing a quilt once of moderate size and something went wrong between IQ, tension, just a little bit of everything. I was watching it but thought everything would be ok. When I got to end of row I couldn’t live with the result. Pulled it off the LA and sat in front of TV and ripped it all out and started over. Luckily the fabric didn’t show what I’d taken out. I feel your pain. Also loaded batting wrong way once. Realized it half way thru quilting. Took it off bottom roller put ironing board up to LA and used strip of iron on lightweight interfacing to add a strip of batting. Cordless iron made that process easier.