Was cooking 2 racks baby back ribs yesterday at 225F. We were about 2hrs in and I noticed wisps of smoke coming out of the hopper. I opened the lid and a bunch of smoke poured out of the barrel. I thought there might be a grease fire happening so pulled off the ribs and started the shutdown cycle. Realized that was probably a bad idea so switched her back on and ran it at 150 while scooping out all the pellets from the hopper into a metal pan. Continued running at 150 while the temp gradually came down and the auger cleared the burning pellets out of the tube. While waiting for this to finish smoke was just pouring out of the hopper. Luckily the fire never made it all the way into the hopper.