Celtic Wolf, No - not windy - I really am at a loss - did not open and close the egg over this time - the bottom vent was open no more than 1/4 - 1/2 inch - the top vent was basically closed - and the temp was stable with meat on for 3 hours with that set up - so I walked away for a couple of hours - and when I checked back on it - it had spiked - I am going to replace the gaskets and try again - and see what happens - I have been using the egg for years and never had anything like that happen - maybe I got the egg gremlins that opened the bottom vent on me - anyway, it justified to be looking at a GURU again