Samsung S6, S7, S8 Nougat (7.0) Issue.
Some users are reporting a screen flickering when they resume the app from the background.
The latest version of chess time, version 18.104.22.168 and above have the fix for the constant flashing.
This fix will detect the start of the flash and then close and attempt to reopen.
Please update to the latest version of Chess Time if you have a Samsung device and are running android 7.