I use Thread Heaven when I do handwork, and I let the piece dangle to untwist the threads, but it wasn't until I read something somewhere and realized that I was givng my needle a little twist as I pulled it from the fabric, causing the thread to twist, that I realized I was the problem. So I started trying not to twist the needle, and now I don't have as many problems. Of course, if I don't do handwork for a while, and start on a new project, I have the same problem until I have the "duh" moment and pay attention to what I'm doing.