So I have a problem. Started last yr towards ends of burning season and noticed the damper door gasket on my Harman tl300. Was falling out. So this yr about a month or so before I started burning I cleaned out the old gasket and cleaned the grove out very well and used new gasket glue and let it sit up a few wks before I burned in it. Now about 1 month after starting up the stove the gasket is falling out of place again any input ?