I found this thread:
The problem in this case is not the duration of the cookie, but the maximum duration of inactivity.
The default settings are 15 minutes, so after 15 minutes of inactivity in PrestaShop, the administrator will automatically log out.
This time can be easily adjusted in the following folder:
classes / controller / Admin Controller.php
Look for line 2288, where you will find the following code:
if ($ this-> context-> cookie-> last_activity + 900 <time ())
For example, this number should be replaced with 3600, which increases the log duration from 15 to 60 minutes.
We would not recommend setting the login time much higher because the logout also serves as security.
and this: https://www.prestashop.com/forums/topic/308913-admin-login-timeout/
they both seem to be appropriate solutions. I'll try. Also I'm trying with firefox ( I am currently using Chrome). I'll let you know...
As of the apache errors, Yes there are modules that don't work correctly: Social media share buttons doesn't appear on the pages, although I have set it on.
Should I uninstall it and reinstall it?