There seems to be a shader problem.

[crablue]

Some smartphones have shader problems when I build games. A black rectangle blinks on the bottom part of the game screen.
On some phones, a number of black squares appear here and there on the screen.
If I remove the tk2d sprite for testing, this problem does not occur.

My game is about to be released, and this problem seems serious. It is also a problem that is happening with the latest smartphones.

unity ver : 2018.3.7
tk2d asset ver : 2.5.8.16

[unikronsoftware]

You will need to get a graphics capture to figure out what those are. Could be a sprite, or something else (shader error?) Once you get a capture you should be able to run through and see what is there.

It could be a tk2d sprite if its in that location - but what features do you use?