I have only used my Avalon Olympic about 4 times and i can't seem to keep a flame going. The only way i can really keep the flame going is to leave the door open 1/4 inch. I am burning aged, dry hedge. I get the fire roaring and then shut the door and it goes to no flame in about 2 minutes. I have the air pushed all the way in and i have tried both with the damer open and the damper closed still but can't keep the flames going. Is this normal?