We have had our Castille for 4 years. Towards the end of last winter, it started blowing out soot, covering the basement in a fine black. My hubby does regular maintenance on the stove (it's his other love). We even had a pro come out to look at it. He couldn't see a problem, but did a thorough cleaning. We figured it was bad fuel (had 3 tons of Ozark - horrible pellets and lousy customer service.) Started out this year with a clean burn, but now the flame is getting crazy on high, and we're beginning to see soot blown out again. We use Penningtons for the most part, but have also burned Heartland Premium Oak (pricey!) Same problem. Quadrafire can't (or won't) help us, and we're having a hard time locating a tech to work on the stove. Any suggestions? It's really cold here today, and we are missing our baby!