Thanks for all of the advice. The thread is the same weight in both top and bottom. I was told to never play with the bobbin tension from the dealer. I think I will try adjusting the top tension and see if this will help. I forgot that I did change the top tension a few weeks ago, maybe I forgot to put it back. Usually I don't touch my tension at all for fear of messing it up. I also thought my speed could be off, but no matter how fast or slow I go it still messes up. I won't get a chance to play with it again until the end of the week. So I will let you all know what happens. Thank you.