Tap on the tiles and see if they are hollow or loose---I doubt if the heat has anything at all to do with the repeated failure of the grout.
Crumbling or loose grout means movement in the substrate. We have used cement based, epoxy and urethane grout under heated floors. No issues. Quote: why is the grout not coming loose all over the floor? I would investigate how that floor was installed and products used. Would be a shame if the floor all had to come out because of a incompetent installer. See if there is a heat vent you can remove and look at the layers of the cake. That might point you in the right direction of a answer to the cracking/failure of the grout. If you repair it you might just be chasing your tail.
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