If the tile cracks are long continuous and extending across multiple tiles the concrete below has likely cracked.
Ceramic tile keeps splitting.
Dirty substrates thinset not mixed correctly thinset skinned over not enough thinset too much thinset wrong kind of thinset and on and on.
The only wholesale cure is to strip the tile and then install a crack isolation membrane before installing tile again.
You have to be very patient in cutting tiles whether it is a wet saw or a manual tile cutter.
Fourth a foundation problem can cause tiles to either pop at the grout lines or to form cracks in the tile surface.
These joints are there to absorb pressure from shifting tiles.
It s a great book.
Because of the compressed fragile nature of tile it can crack break and fragment when you try to cut it.
In there i looked up loose tile and i counted no less than 30 different causes listed in this book.
If you push the tile too fast towards the cutter you ll increase your chances of.
There are a few probable causes but before you tear up the tile and start over try this quick cracked grout fix.