Carol here ~
Lena Longarm is misbehavin'. I mentioned last week that her tension was not consistent and I had to keep adjusting it. That never happens, I usually finish up one quilt, load another and keep on going with no tension adjustment necessary. I remembered that last time this happened I needed to replace the check spring. The check spring regulates the thread tension and stitch formation to maintain consistent pressure as the needle moves. A worn spring leads to broken threads, skipped stitches, uneven tension and lots of snaggles, top and bottom.
Ugh. Definitely what's happening. That snaggle was just a few seconds in the making.