Well, I am not pulling my bottom thread to the top so maybe that has something to do with it. It can't be the wrong sizr of bobbin because I have only used the ones that came with the machine. I have never purchased new ones yet although that is on my list of things to get.
The bobbin isn't wobbling while filling but the spool does. Would this matter? Does the speed at which you fill the bobbin matter? ie, I heard once not to fill the bobbin with the presser foot fully down, only press to half speed.
I do wonder if I am not trimming the tail close enough while filling the bobbin. It could also be that I have been going along and stopped to quickly, unwinding it a bit and then continuing on with loose thread. I will have to try to pay attention to what is going on for details like this the next time it happens. Only I am usually paying more attention to the sewing than the machine itself if that makes sense. I'll try anyway. I would love to stop this.
The presser foot has been up while threading though.
Tara