The default Login Session Lifetime, otherwise know as Login Timeout, is waaaaay to short. You login, check your email, procrastinate about some other things, and then… You have been logged out :/
Here’s how to increase it:
First, open config.inc.php in an editor
Second, Add the following to the end of file
// Custom settings $config['session_lifetime'] = 1440;
1440 minutes = 24 hours = 1 day. That should be enough.
Don’t forget to reload nginx/httpd/whatever! 👾