I just redid my bathroom and the grout keeps cracking and falling out between the tiles on the window sill. I just redid the grout for a 2nd time last week and it's already cracking. I've taken two showers in there so far. I sealed the grout too. What am I doing wrong? The grout is from Home Depot along with the sealer. The sealer is the exact one the grout mfg recommended.
Please help me!!!! I'm going nuts with this bathroom.