I have a brand new lopi agp pellet insert. Installed in August and since November we have burned about 2 tons of pellets. We run the stove on pilot mode using the Tstat setting on the stove linked to a wall mounted thermostat. The stove has been shutting down recently without reaching the programmed temperature. On pilot mode it is suppose to run continuously and lower the output when the thermostat is not calling for heat. We can't figure out why it is shutting down. We clean it regularly so ash buildup isn't a problem. Any thoughts or suggestions would be appreciated.