Thread is simply not my problem with my 830. My machine has had 2 faulty sensors replaced, the upper threading system replaced, the auto threading spring replaced, the BSR spring replaced and two weeks ago a part literally fell out of the machine on my work. None of these things involved user error(I've been trained thoroughly and have close to 5 million stitches on it). I love my machine but I think it's similar to that old song, "There was a little girl, who had a little curl, right in the middle of her forehead. When she was good, she was very, very good. When she was bad, she was horrid!". I love it when it's acting right. I just wish it would behave more often than not.