I haven't had any problems until I started this quilt. I have learned to listen to my machine. I know when the bobbin is just about empty as it makes a certain sound . Course that doesn't stop me from trying to get that last inch of fabric sewed lol I guess after I finish this quilt I will have to try a different brand. I have plenty in my thread box just sort of used to the Coats and Clark. Guess I am a diehard as I have used it for many many years.