I recently replaced the door and glass gaskets in my Hearthstone Shelburne, which has been very consistent over the last 8 years. Suddenly it overheats quickly with the register open from full to 3/4 closed or dies with the register 3/4 to fully closed. The glass blackens overnight, very frustrating. If I didn’t know, I would have guessed unseasoned wood, but I am burning oak and cherry seasoned 2 years. Any ideas or suggestions? I’d appreciate them…