Hey everyone I have a quadrafire cb1200. It won't stay running for extended periods of times. It's clean, the pipes are clean, the pot is clean. When I start it up it starts and runs fine for a few hours. The out of no where shuts down. The hopper is full and there are unburned pellets in the pot. The light is on. There are no clinkers. I remove the pellets from the pot and hit reset and it ignights without a problem. Then runs for a few hours. Then randomly shuts off. Any help would be great