Member since 2/27/07
Date: 11/13/12 2:56 PM
I have a Janome 350e, which is the same version as your 300, except that mine has the auto-cutter option.
It sounds like you may be clipping your bobbin threads too short by pulling the thread taut before you clip, and you're actually snipping off the tie-off stitches.
My auto-cutter clips short, but not absolutely flush with the back side, and I don't have any issues with the stitches unraveling.