I too have noticed some loose tiles, they have not popped off but are a bit loose, because the grout at the coping line came off, and I gusee some water got behind the tiles. My question is, can I just re-grout for now in hopes that they won't pop off, or should i cut the loose ones out and re attach per the above reccomendations? Note these tiles are above the water line as part of a raised spa.