Hi - we're new to wood stoves and just had an Apex 42 installed. We've only had a couple fires so far, but have noticed that the cat temperature gets really high (1100 to 1200 degrees F) with a fire box about 75% full and a couple hours into the burn. Is that normal? The owner's manual is vague, but seems to indicate that the normal operating temp for a high burn is around 600 degrees. The other concern is that once the temperature gets above 1200, the door won't open -- we can lift the lever only a little and then it seems the latching mechanism is stuck. We have to leave the bypass open, turn the air control down all the way to the left and wait for the temp to drop to around 800; then we can open the door. By that time, there are orange coals, but no flames. Thinking this could be a safety feature, but can't find it documented. Again, we're newbies, so any insight is appreciated -- thanks!