The same thing has happened to me. I have made quilt for my son, it has been a HUGE project - I couldn't believe when I actually finally finished it. But the quilting lines (straight line grid 4" gaps max) keep breaking. Did you, or has anyone, found a way to fix this? Should I add more quilting lines (it would mess up the design)? I thought of adding some stitch-in-the-ditch with invisible thread, would this help? I used Aurifil 50/2. I wanted to use thin thread as I am a beginner and didn't want to make more of a feature of my (wonky) quilting lines than necessary. I think this was my mistake. At the moment, I have unpicked and restitched several lines. Now, whenever I spot a break I fix it by handstitching, but I don't feel confident that these fixes will last.... Any help would be much appreciated. I seem to be unable to move on from this quilt, as every moment I get to sew I'm fixing the breaks and I want to sew other things.....
Thank you in advance.