what can I do? I have installed 1000 sf porcelain tile in my house. everything looks good but in about 10 tile for same reason the guy that did the installation made a littly mistake. on the corner (about 5 places) tle tile move up and down causing the grout to get loose. I notice that it mabe need a littly more mortar in that space. is it any product that i can just remove the grout in that space and inject samething thrue the grout space in wish flows under the gap and fill that little space between the tile and the mortar? this way the tile will have no motion. I am sorry for my english, I just move here from brazil 4 year ago. I appreciate your help. thanks Anna Maria.