We have osb particle board subfloor, w/ a 3/8ths inch plywood underlayment underneath ceramic tile. Our grout is cracking everywhere, and tiles are loosening. The underlayment was stapled to the particle board subfloor. I know this was improper. We were also told that tile should never be put over osb-is this true. To have it repaired do we need to take up the tile, undrlayment AND the osb?

OSB subfloor w/ 3/8ths inch plywood