Sleep mode not always kicking in.

[roninxg]

Think it's called sleep mode. You know when you stop using the phone and the screen goes black? I find it randomly decides not to do it and will stay on for hours. 

I have tried turning Ambient off and changing the time before it starts but it just keeps happening. Pressing the square on bottom right of screen shows nothing else is open, can't figure out what might be causing it 

[Nathan34]

Hi,
As your problem ever been solved?
I'm currently experiencing the issue with Xperia 1 IV.
Time to time, the phone will not go to sleep mode and screen will stay awake for extensive time.
I have performed a software repair with Companion and several reset and even started in safe mode but still the same.

[SkyNet404]

Hey there, since this phone is fairly new and you've already tried software repair, I think it's time to contact Sony as they might need to look into this one, maybe they can help. 
 

[gustavjohannes]

Hello nathan34,

Do you by any chance happen to use Poweramp?

Or a microSD card?

Cheers