When cracks in a floor seem to run in a continuous line through a few joining tiles, it is likely because the concrete slab beneath it is cracking. There is no sure fire way to prevent this but the best is slipping a membrane between the slab and the tiles. When I see sheet vinyl already down I have opted to leave it for that reason. There are adhesives that bond to vinyl and the vinyl over a crack will absorb most movement of a slab.
More importantly, it is in the best interest of the owner to have and keep SPARE tile when a job is done! And I typically advise to replace the tiles in question just before selling the house unless you have plenty of spares, as it can occur again. It is the earth moving! At least to the new owner the floor will be in acceptable condition.
There will be more written about this later.
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