Been burning for over a month now with pretty good success. Suddenly the last few days have been terrible. Close the door, fire dies down. Hardly any secondaries. I know, I know, sounds like the wood. Same wood I've been burning though. What else could have changed? The weather has been pretty warm, 50's today, maybe draft? Anything I should be checking? As soon as the rain stops I plan to check my cap. Thanks for any advice.