Had a M55 installed 3 months ago. Burned almost a ton of pellets without an issue till last night. It starts fine (manual mode), level 3. Then agitator kicks on. Then the convection fan turns on. Which is all correct with good flames to this point. A short time later (either immediately or within 10 minutes) , the agitator stops running (I have the right side cover off to watch the chain drive). Then the flame dies down to below the typical level 1 amount. Pellets are still feeding but not burning well, probably as agitator is off. Pellets just glo red. When I hit the off button, the agitator immediately starts again. So my conclusion is that it isn't the inline fuze, as the agitator runs at the beginning and the end of the cycle. The burn pot, etc. has been cleaned. The agitator does rotate when the chain is moving so its not jammed (even in the hot mode when I turn it off). There are no warning lights on or blinking either. Any clues?