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I'm having the same issue with my gasket. I just got my BGE for Father's Day and have done 2 low temp cooks (chicken then ribs) in order to "season" the gasket. After the ribs came off last night, I raised the temp to 400-450 for about 20 minutes in order to clean the grate and when I opened the lid and the the gasket had about a 4 inch section that had come loose.
Should I go ahead and replace the gasket or continue using the original for awhile since the gasket does appear to form a good seal once the lid is closed. I would like to at least of gotten a handful of cooks on the original gasket.