As Stella said, when the weather changed this last Spring, I was one who tore my hair out with the EZsoy frost issues and finally threw in the towel after battling with it for over a year with each change in weather. I'm using a blend now and (knock on wood! ) so far, things are going well. EZsoy is very tempermental, though an awesome throwing wax! Along the lines of heating the jars, make sure they're not sitting on a cold surface after you heat them and while pouring. I always placed a layer of paper towels (or napkins) beneath them to insulate the bottoms.