I would verify that the one touch sweeps are tight to the bowl (make sure they are assembled in the correct order) and then measure across the bowl and the lid and make sure they are round. If not, give them a little "hug" to put them back in shape. Then, if its newer, grill on that sucker to build up some "gunk" and she will seal up real nice. Also stay away from tool holders or shelves that sit on the lip as they will let air in. I have my kettles so they will cool down in about 20-30 minutes depending on how windy or cool it is out. When I have the tool holder on them, the time is drastically increased to about an hour.