I tried searching for a previous topic on this, but I am not sure what kind of key words to use.
I was FMQ and moving along just fine, and then my bobbin ran out. I changed it, then KLUNK then the bobbin thread gets tangled. Okey dokey, I stop, untangle, check the bobbin and it looks ok. I look at the back of the quilt, and the stitching looks good for a few inches and then my back side of stitching has a loose loop every 8 stitches or so.
I rethreaded, and it does it again.
I rethreaded, cleaned the bobbin casing, set up, and again, the same thing.
I walked away before I got upset. Tomorrow I will try using a different bobbin. Anyone else have an idea?