Bernina - skipped Serpentine stitches with flannelette backed quilt
Has anyone else had this problem? I'm using stitch #4 (serpentine) to quilt a baby quilt which has a flannelette backing. My Bernina is occasionally skipping a stitch - always in the same position on the outermost left hand curve. I'm using 40 wt thread, same thread in bobbin, a brand new Schmetz quilting needle, size 90/14. Speed is not a factor, it happens when my speed is fast or slow. I'm using the walking foot. I have tried varying the stitch length, that is also not a factor.
I just tried this stitch on a sandwich I made that wasn't backed in flannelette, keeping everything else the same (needle, thread) and the problem goes away.
Any suggestions to resolve this strange problem?