On Sun, 19 Feb 2017 13:39:36 -0800 (PST), home owner
wrote:

The rubber tiles have shrunk so now:

1/2" to 1" wide gaps have developed between the tiles

the sides of the tiles have turned up

The combination has resulted in a tripping hazard.

Dig that crap out, throw it away and get something more appropriate
for a walking surface.