Have you taken the bobbin case out and checked for lint or a loose piece of thread? Have you changed the needle? Sometimes those 2 things are the culprit.
Good Luck,
Susan

Do you have the bobbin case threaded properly?

I've taken out the case and blown everything out several times with compressed air and can't find anything in there. I've double checked the threading pattern several times. Had to find the book to look it up just to be certain.

Canned air is not going to cut it, it just blows everything further to the back...get in there with a brush and you will be amazed at the stuff that comes out of the machine.

I got brave and unscrewed the bottom of the 19365 machine..yowza, found stuff in there too.

Can it be the thread quality? That is another thing to check....if the thread has burrs ...well that can cause problems. Are there any little nicks or catches on the bobbin chase that the thread is catching on?

Same problem here. The top thread is catching on the little side lever on the bobbin casing (not the lift out one, but the side one), and each stitch makes a new loop catching in the same place until it completely jams. Help!?!?!?!

Make sure the thread is coming off the bobbin in the right direction (on my Bernina the thread comes off the bobbin looking like the number 6, with the circle of the 6 being the bobbin and the curved line of the 6 being the thread). I agree that canned air is not good, I've seen a machine jam packed with stuff blown inside...I recommend a small computer vacuum...use mine all the time. Nicks or burrs on the bobbin case will cause problems too. Is your needle inserted in the right way? Most machines require the flat part of the needle to be facing the back of the machine.

Mary