I just checked the bottom tension and it seems fine. Last night I decided to try a metal bobbin. I had been using plastic because on my previous project the metal was making a lot of noise and something didn't seem right. When i switched to metal I started FMQ and the problem happened pretty much right away. I started up again after rethreading and it almost stopped happening! At that same time I threaded through that hole so I'm not sure if it was threading through the hole or the metal bobbin that fixed the problem. I hesitate to say fixed, because it still happens occasionally but before it would happen every minute or so and now it's happening about every 10 minutes so I can get a lot more done.