Loose shower tile is a warning sign, not just a grout repair

If shower tile sounds hollow, moves when pressed, or keeps cracking at the grout lines, I would be careful about treating it as a simple cosmetic patch.

A few things to sort out first:

• Is the tile loose because the setting bed failed, or is water getting behind it?
• Are there soft walls, swelling trim, musty smells, or staining below the shower?
• Was the shower built with a real waterproofing system, or just tile over backer board?
• Are cracks at changes of plane where flexible sealant should have been used?

Sometimes a small regrout is fine. But if water has reached the wall cavity, patching the surface can just trap the problem until the rebuild is bigger and more expensive.

Longer guide on what to ask before approving a tile repair: https://sacvalleycontractors.com/blog/roseville-loose-shower-tile-grout-cracks-waterproofing-repair-guide/