For correct work of application:
1) In “Settings ⟶ Battery ⟶ STAMINA mode” select “Never”.
Screenshots
2) In “Settings ⟶ Battery ⟶ Ultra STAMINA mode” turn it OFF.
3) In “Settings ⟶ Battery ⟶ ⋮ ⟶ Battery optimization ⟶ Apps ⟶ Prof Reminder” select “Not Optimize”.
4) In “Settings ⟶ Storage & memory” turn OFF “Smart cleaner”.