First time, ran out of fuel, refilled and restarted. Pellets feed, ignitor lights, fire starts, 15 minutes later, I notice the fire is almost out and the house is still cold, and the combustion light is blinking like it does when it runs out of fuel. The burn pot is empty with no pellets having been fed apparently since ignition. I thought it was strange, restarted and it ran regularly for over 24 hours. Yesterday I shut it down for a couple of hours to replace the door gasket, and the same thing happened when I turned it on. I was right there and restarted it before I got a blinking light, but it never fed beyond the initial amount to get started, and the house was cold. It's been running fine all night and so far this AM. Any help appreciated.