Be sure to read How to get debug information and open a proper issue to provide necessary logs and information.
Issue description: After a while, a black full-screen rectangle slides in from the right and covers the whole screen. To me, it looks like some sort of screen-saver, but with a very short duration. Could this be from Yatse? I noticed it there, but not in other apps and have killed all the other apps.
Logs: I can try to make a log for that, if you need.
Screenshots: It’s a black screen.