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Based on the way the egg broke cleanly at the top of the table my thought would be the egg expanded during a hot cook and must have pushed against your table. Assuming this happened alot over the 2 years you have owned your egg andit finally gave. How much of a gap do you have between your egg and the table?
Not sure if BGE headquarters gives a clearance, but the table i got through them has about a 1/2" all the way around.
I have never tried to take my egg to a tailgate (i only have a large), but i would think if you can remove all the hot coals from the egg and leave the lid open that it would cool off much quicker then it normally takes.