Hello, We recently had the double-door Z42CD from Kozy Heat installed and have used it five times. This past weekend I noticed that the cement used to attach the flat braid between the doors had disintegrated to a fine powder and the gasket was just dangling. This cement is white. Is it silicone? I assume it didn't stand up very well to high temperatures but this seems very quick for something to fail. The highest temp I've seen, with a thermometer on one of the doors is 650. I emailed Kozy but got no response. Called and the woman who answered didn't know why it would happen and said to call the dealer. Did that and he said he'd call them and have them "send you something". I'd appreciate comments, please, especially from any who sell/install these units. Thank you.