I have had this Absolute Steel since they first came out. I am far from an expert and would like advise/thoughts from people who know more than I. The stove has been burning well all season, with the pipe temp around 300 and the stove top temp usually reaching around 500. Recently, the pipe temp has been climbing to around 350 and the stove top temp maybe stayed the same or maybe climbed slightly to 525-550. I don't know why the change. I am a bit paranoid because this stove warped and was repaired a few years back (there was a gap between the metal and the gasket that seals the bipass flap). I don't see any warping, but maybe need to inspect it further. I wonder if maybe there's air leaking in from the firebox to the top section of the stove where cat is housed? Thanks for any help.