My new Landmann's GOSM runs smoothly, around 200 degrees and then all of a sudden the wood chunks catch fire and It's blazing at 350 degrees.. I thought maybe it was getting too much oxygen, so i made sure the lid was on tight.. but that didn't help. Now i'm trying to smoke with 3 chunks, instead of a full chip box.. Any thoughts on what's going on? How can I keep the chunks from burning? I have this one: http://www.landmann-usa.com/34-gas-easy-access-2-drawer-vertical-smoker.aspx 34" Gas EASY ACCESS 2 Drawer Vertical Smoker 3405GLA Thanks!!!