Phone keeps turning off

[Emilylouise]

Can anyone  help me 

My new Samsung galaxy a21s +5g 

My phone keeps turning off when I am on it 

It's happening all the time can anyone help me 

[Glenntech]

Are you using a case on the phone. Sometimes the fitment of some cases can be off and not fitting around the power button properly. Easy to check. Use the phone without it on and see.
Maybe just check the power button presses OK.
Not sure if your phone would have this. But some new phones have a clear plastic film around the frame that can shift and get in the way if it's in a case.

[Emilylouise]

Thank you so much I do have a case on it and Its dose it when it not on as well

[Glenntech]

Is it that the screen turns off or the phone powers down.
If its the screen turns off. Just check, if you go into settings, then display. Go down to screen timeout and see. Normally set for one minute, but you can change this.
Also go into settings. Device and battery care.
Tap on the 3 dots on the top right.
Go into Automation and see if auto restart at set times is on. If it is try turning that off.
Seems to cause issues for some