Well today this is the second time this has happened to me i think i know the answer but want to here what you guys think. i load the stove on a hot bed of coals and the pieces i threw in first were small and very dry so they caught very quickly. i still had to load the rest of the stove. so i continue loading and having the door open more than id like while the flames building up still trying to load the stove. so by the time i shut the door its going good and then as soon as i shut the door i here a puf puf like and the chimney gets warmer and warmer quickly so i shut the damper quick and it stops immediately. i know theirs not creosote build up checked it today. i think i need to let the last load burn down more and get the door shut before its raging. i think the build up of gases gets going good also then puff i shut the door and its like oh crap. i need to let the last load burn down to coals more and get the door shut quickly.