Smokin: I am just telling you what Cookshack told me about the "Big Bang". I am a retired Firefighter, once I read what you wrote, and what cookshack told me, I think the "Big Bang" is either a smoke explosion, or a back draft. I really think that both of these conditions are related. You have a smoldering fire, that isn't getting enough oxygen to free burn. Sometimes the temperatures inside a structure in this situation will reach 2000 degrees. One of the signs of a structure that is in a back draft condition, is you will actually see the building breath. The smoke will pour out of every crack in the structure, and then it will take a breath, and the smoke will get sucked back in (I haven't watched the new smoker to see if this is happening). The smoke explosion or back draft happens when the structure takes a really deep breath, or a door or window gets opened. You get a rush of oxygen, and all of the super heated fuel/smoke ignites or explodes. The solution for the fire fighter is to cut a big hole in the roof of the structure, and let the heat and smoke out. This is counter productive for us smokers. The answer is to do like Cookshack told me, and reduce the amount of fuel that is smoldering in the smoker.