Recently my Breckwell stove began acting very strange. It will burn fine for a few hours and then the entire stove fills with flame. A huge ball of flame forms about 3 inches over the burn pot, and there are flames coming from below the burn pot too. The stove gets incredibly hot and gives off a strange burning smell, as well as filling with smoke. The ash box is empty, I cleaned the pipe and blower, my rope gaskets all seem to be good. Anyone ever hear tell of a proplem like this? I had gasket issues last winter, but that just caused a lazy flame and lots of smoke. This is nothing like that and I can't figure out what is wrong. Any ideas?