Grout properly mixed with the right additives will flex. Grout not properly mixed will not flex. If the rig flexes, which most will then you better hope it was mixed properly. Early signs of cracking on a new rig will surely lead to more.
You will either need to stop the rig from flexing which is doubtful or replace the grout.
Make sure you understand the difference between grout and cement. Grout does not hold down the tile only fill the void. Cement holds the tile down. Hope this helps
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