This is the second morning of waking up to find the burnpot on my 10 CPM overfull. The stove was purchased this past summer as a refurb. Bottom settings are 1-4-1, OAK installed, and up until now has been running fine. It's burned about 25 bags of corinth pellets which have been burning well. I've been cleaning per the manual recommendations. After looking around the site this problem usually means an air flow issue - Nothing is obstructing the OAK and yesterday I cleaned the burnpot, removed the cradle and cleaned all around that, removed and cleaned behind the heat exchangers which weren't very dirty. The pellets are from the same batch/pallet. Today I guess I'll try to clean the vent although I can't imagine it being that bad after only 25 bags or so....any ideas/suggestions would be greatly appreciated.