I have a St Croix Prescott EXL stove that starts and burns as normal for 15-20 minutes. Once it reaches operating temperature the auger then shuts down and discontinues to feed resulting in the fire going out and the stove shutting down. Everything else appears to be ok and working correctly as it did in the past. I have cleaned the stove thoroughly and there appears to be no blockage or drafting issues. My unit was built in 2001 and therefore has the older analog board so there are no indicator lights available to assist me in diagnosing the issue. The only possible cause that I can think of that might have contributed to my issue is that I did burn hard pellets for my smoker in error for one fire before I discovered the error. I cleaned those pellets out and cleaned out the stove completely before replacing with the correct soft pellets. Does anyone have any suggestions on what to try first. Is it possible that the proof of fire sensor is faulty and that is resulting in the auger shutting off ? If anyone has experienced a similar problem I would appreciate your help. Thanks.