Bathroom Tub Faucet

[thiggy]

It sounds as if the valve may not have been properly secured to the wall studs. There may have been a piece of blocking that just dropped out of position, allowing the valve/faucet to spring out of position. If that is the case, you probably will have to open the wall. Go from the back side to avoid having to rework the tile. Let us know how you resolve your problem.