We were cleaning out the wood stove for past season and notice drywall above mantel bowed out quite a bit, no crack but the curvature is alarming, had a painting on the same spot, one can clearly see noticeable curved gaps on the and bottom of the painting. We have scheduled a sweep with a camera to come check it out along with cleaning. We wonder if the insulation come lose somehow leaked heat from the liner? We were burning hotter than before as the maple, ash, and other hard wood are c/s/s closed to 3 yrs ago.