In my en-suite it is not the floor tiles that are loose, but the chipboard to which they are stuck. Can't see any alternative here to chopping out the tiles and the old adhesive then screwing down the board properly.
Had the same problem in adjoining bedroom and solved it by removing carpet and putting screws through chipboard into joists. If only builders would not use the ubiquitous nail and go for screws instead, such problems would not arise.
Fix-A-Floor Repair Adhesive - 300ml Stock Number: ES1708231
Suitable for porcelain, marble, stone, ceramic, wooden flooring and underfloor heated areas - no need to replace old tiles; simply drill and fill using this super strong adhesive fluid
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