Not sure yet. I have had that problem with the smokey joe as well. I'm putting my faith in Webers R&D that they fixed the air flow problem. My cook today was indirect with one charcoal basket full, wings and country style ribs turned out good with no problems so far.
WSM, Mini WSM, Weber 22.5" OTG, Weber Jumbo Joe, Weber Smokey Joe, Brinkmann Gas Grill