Screen timeout troubles My galaxy note 4 is only staying on for about 15 seconds before timing out. And every time I try to change it a pop-up says that it is set to 15 seconds and I cannot change it. I've turned off stuff and messed with my settings as much as possible and am still not able to fix the problem.
Check as suggested by wbogacz. If it still does not works, restore the settings to factory default. It is better to have default state before we proceed.