Installed our Harman Absolute 63 last February and loved it. Heats all of our 2,000 square foot home. Recently I have noticed a clicking sound when the fire ramps up and then calms back down. Had the dealer come out and said it was normal metal expanding and contracting. I’m adamant that I have not heard this sound before. Anyone else experience this? Driving me nuts since it is in our living room and we have not heard it before.