Apps never running/no notifications

[Fakkurai]

hey guys, i'm having a problem with ta-1000 android 8.1
i never get any notifications and apps such as facebook/viber/messenger always seem to turn off by themselves

that means no one can contact me unless i am using those apps

i have wifi power saving disabled and i have allowed those apps to start with the system

 

[Fakkurai]

found a solution, there is an option in apps that allows apps to activate by themselves when they want