The first two days there were warnings flashing, which upon reading were caused by the video settings in my custom settings. Canon CPS cleared my Custom Functions when I had the camera repaired. They changed the main board and the EVF board. I have not since had the overheating warning you spoke of, but the problem persists that the camera freezes at least once per waterpolo game I shoot. Games are outdoors, and yesterday, temps were only in the 70's. Sometimes the freezing happens well into the game, like maybe the 4th period. Other times it occurs very early in the contest. Multiple SD Cards and Batteries.
Will end up returning to CPS again, but will wait until there is some downtime in my sports shooting. I've never had this issue with my 1Dx, which I can always go back to shooting, but seems such a waste to have a 45meg camera sitting in the safe cuz of the freezing problem.