Mac automatically logs out?

Question

macOS

There is OS X 10.10.5
Previously, the lock screen appeared when idle.
Now the session is automatically logged out.
Didn't do anything in the settings.
The checkbox "Exit after ... minutes of inactivity" is not worth it.
Who knows how to solve the problem?

Answer 1

Check in the settings "Energy saving". He's most likely going to sleep. The screen saver here may not be in business.