Originally Posted by Debra Mc
Don't really know what to tell you because I have had that same thing happen to me before too. Try & change the needle & see if that helps & rethread the machine. There are gremlins among us!
That, and try cleaning out UNDER the bobbin case. There may be a little dust (lint) bunny under there. I have a Janome and it's very temporamental when it comes to dust or lint bunnies