It has just begun to have a problem. I cleaned and oiled it, and have been playing with the tension, but it hasn't helped. I use 100% cotton. I have had this machine for 5 or 6 years and thought maybe the tension had just vibrated looser, but nothing is helping. This machine is non-computer/non-digital, and 2.0 is quite small for a stitch length. I will keep trying.