I have a 1994 Brickwell P24FS. We have lived in the house for 4 years. It was professionally cleaned 1 year ago and we clean it weekly as well as a full, take the panels off, etc. and clean everything cleaning quarterly. In the last 2 months, sometimes (20% of the time) when we move the setting from high to low, the feeder will run continuously without stop and will over flow the bowl and cause a large fire outside the bowl. I have taken to watching it to check and I can hear the feeder running non-stop and see pellets dumping in to the bowl. If I turn it off and back on, it will go back to normal feeding. Sometimes (5% of the time) when the fire is on low, it will just start to feed pellets continuously without stop randomly. We are not sure what is causing this and since hardly anyone in our city or part of the state has a pellet stove, there are not many repair people. Any thoughts on what is causing this?