i have a Bernina 700D Overlocker and love it. Most of the time. Whenever i change the thread over, it always takes me 3 or 4 or 7 goes before it will work properly, but i don't know what it is that i do differently on the time that it does work.

The problem is the red thread (3rd one across), it somehow comes out of the very last bit once i start sewing. What am i doing wrong?