So I have been burning all season cleaned the flue once for very little build up. Nice flaky stuff. I started the fire the other day and holy smoke. She started to draft into the house not good. Opened all the windows and got the box fan blowing. Decided to let the stove cool and check out what is going on. Pulled the stove pipe, and started inspecting everything. Well after cleaning everything I decided to take a climb up to check the chimney cap. Yup she was plugged not tight as smoke was pouring out but definitely choking out the old fire. Well I'm not sure if it was my wood or my father in law throwing single logs in and letting it simmer all day. I'm guessing latter of the 2. Anyway I added another section of chimney pipe and cleaned the cap. All is good now but figured I would share my experience.