I have a blazeking ashford 30.1. Recently it seems like the stove isn't getting air. With the thermostat tuned all the way to the 6 o'clock position the flames just seem lazy. Usually it is a nice rolling flame and really puts the heat out. It also seems to be going inactive with 3/4 of the load left in the stove. Could this be due to the cat starting to become plugged? I can hear the thermostat close but haven't taken the cover off to inspect anything.