A few precautions to follow... never crank the burner heat above Medium, as CI doesn't need the higher heat.
Don't leave a pan on heated burner without food in it, except to preheat if necessary.
I have several #8 Griswold smooth bottom skillets, that sit perfectly flat... until heated, and then they spin. Once cooled down, they are perfectly flat again... Go figure!!
I have just decided the Gris #8 smooths don't like me very much! :)