It could also be your taking the curves too fast. But start at the beginning, check the threading, and try to balance your tension, then try taking it a little slower around the curves. Does the tension seem to be alright on the straightaways? Take a break then start again, don't let it get the better of you. Before you know it you will have it down, and you'll be doing it and realize, I'm doing it, and really enjoying it. You just seem to fall in a groove with your machine. So, don't get frustrated.