I've searched for information about this but all the posts I've found relates to chain driven stoves and I understand that mine isn't chain-driven being a 2010 model. The stove is feeding pellets fine, but rather than whirring with the rare clunk where a pellet gets chopped it makes more frequent clunks/pops and the operation sounds more strained. Some of the clunks are somewhat elongated sounds with a slightly grindy/strained character to them. I have recently cleaned the fines out of the feed chamber and have been keeping the stove clean. I have not cleaned the auger tube since putting the stove in the operation...not sure how or if this is the first step. This season I did start burning Country Boy White Lightning Pellets which I've noticed make cleaning the burnpot of carbon deposits more frequent & difficult, so maybe there's a build up somewhere? Any help appreciated!