Samsung S20

[jammi4]

I can't shut it down. Don't know why

[Wezzyd]

Have you tried soft resetting?

[JAMES4578]

@jammi4  Try holding the Power and volume Down Button simultaneously for around 10  seconds until it restarts,  afterwards  try closing down. Could also see if there are any storages issues, may need to see if you can Boot into Safe Mode. https://www.samsung.com/uk/support/mobile-devices/how-to-start-my-galaxy-device-in-safe-mode/ 

some other information here https://www.upphone.com/fix/devices/android/samsung-galaxy-wont-turn-off-fix/ 

[AndrewL]

@jammi4: What happens when you press and hold the Side Key? Does a power menu appear? If not, please head to Settings > Advanced features > Side key > Press and hold > Select 'Power off menu'. 

Furthermore, if you swipe from the top of the screen to the bottom, then again to enlarge the Quick Panel, then the power off menu can be accessed via the power icon that appears in the top right corner of the screen. 

[jammi4]

Okay thanks

[jammi4]

Okay thanks so much