stop spreading fears lah Leongsam.
this is due to improperly laid tiles or that the tiles were not soak with water before laying.
That is the tile were not Properly "CURED" before being cement on -to the floor.
Tile when not soaked in water for curing and bonding tile cement and floor, will
become brittle and cracked in no time when its being pressured after forming air pocket
in between.