I have a Breckwell p2000fs manufactured July 1996. Towards the end of last season,it started to over feed pellets sporadically while on the higher settings. I didn't think too much of it, until it did it this past weekend, and gave me a fire in the ash bin. My explanation would be that the auger is stuck in the feed position. Any suggestions as to a possible cause? Thanks up front for your time and thoughts.