This is very common problem if you have concrete slab. I am living in a metal buildings denver from past 10 years and we have concrete slab. There are too much flexing on floor although we have corrected flex problem but still tiles are popping up. The reason behind this can be poor installation or worng adhesive and wrong technique of adhering the tiles. Another main reason behind this can be excess of moisture. To prevent futher damage, we just keep proper maintenance of tiles and carefully move heavy objects.
