galaxy s4 no options screen wont turn off

[Android Central Question]

Hi folks, I have a Galaxy S4 but when I press the power button on the side to turn it off, I get no option screen, it shuts down for about 20/30 seconds and fires back up on its own, so I simply cannot turn it off. Never seen the option screen with the power off option. I have rebooted several times, power and volume buttons held etc, same problem afterwards. Any help appreciated.

 

[Rukbat]

When you press the power button for how long? A Normal long-press - 2 or 3 seconds - should bring up the menu, a 20-30 second press restarts the phone.