I use a s21 ultraI don't know why but my battery drains quite fast when on standby unless I turn on power saving mode which I kind of fine annoying that i always need to to do thatI have turned off most push notifications and only a few apps uses the...

Can someone tell me why is my battery is draining quite fast when data is on but I am not using my phone? 

I have a s21 ultra. I have been losing battery like if I was using my phone when the screen is off. I have tried wiping the cache partition, putting apps to deep sleep, clearing the cache from apps... And the phone has just been losing battery nonsto...