My 830 was a pain for the longest time until I found out that it didn't like the thread I was using. I switched to Gutermann cones and now have not had one problem. At first, I wanted to take mine back, also, but I hung in there and now I'm happy as can be. It doesn't like anything but cones. I ordered some other brands of cones to see if she'll like them, but I know the Gutermann cone did the trick.