1. if it happen to me, i will find contractor to hack away all the flooring > screed > lay spc flooring. i really lazy to move my furniture
2. contractor will also suggest that "just overlay". For me, i just settle it once and for all. if vinyl spoilt in future, i can just replace myself , no need find contractor again.
u can ask chatgpt why ur 1.8 years tiles become hollow. i suspect is poor installation.
3. my case is at kitchen. i want hack away all the kitchen floor tiles and re-do.
yeah, they will overlay with another layer of tiles.