During the last couple months, the smoke buildup/grease layer on the dome of my WSM has been flaking off. This happened once and I completely cleaned both cookers and lightly rubbed the inside with vegetable oil. Unfortunately, it happened again, this time at the Royal while we were cooking for sponsors and some of the flakes fell onto the food. Anyone have any suggestions for preventing this or is this just a problem that I will have to deal with. I have owned both smokers for nearly two years and this is the first time I have had this problem. Whats weird is that it happened twice with two months. Thanks again.