I have (2) 1200i inserts which I clean once a week. Well one of them just recently on start up I smell wood smoke and everything seems normal except once it is running for a while maybe an hour the hopper lid gets extremely hot to the touch. My other one does not get hot at all. Any suggestions deeply appreciated. Also I notice on low setting that the convection blower runs at a certain speed and the I notice it lowers for no apparent reason. I can have the thermostat at highest setting and it still slows or shuts down for a few minutes.