I did something and my SGS4 will not sleep (i.e., turn off the screen), not from time, not from the power button. Is there somewhere in the system I can check the setting for "no wake lag"?[size=+2]FAQ[/size]
If you've installed the latest update, there is a new option for "no wake lag". If you check this option, your phone will not sleep. It keeps any "lag" from happening by keeping the phone from entering deep sleep. This doesn't affect battery life too much unless you are in a poor signal area. If you didn't check this option, it's time to start investigating.