I know that feeling. I usually run out about 10 inches from the end of a seam. Now I piece with all the same color and wind several bobbins at a time. A lot less frustrating. I also bought a Side Winder and use it all the time. I hate having to rethread my machine. Solved several problems all at once. Love, love my new Janome, but takes a lot of time to get used to it. Many things are the same as on my old Janome, though.
Sue