my screen get hang for 1 minute and after 1 minute gets normal

i m using samsung s6 but my phones touchpad is suddenly freezes for 1 minute and then working normally in this 1 minute all hardkeys are working but my display brightness get dim and touchpad is not working if anyone knows about this type of problem ...

samsung keep screen turn off ka option chalu hoga ya nahi??? marshmallow me to chal raha tha nougat k bad mobile me optiom to hai par chalata nhi hai ek to chalu karo ya nikal do mobile se i m using s6

frnds when i connect my phone for charging then my phone shows this type of window but i don't know about this. can anyone please give information about this. i m using s6.

i want to know samsung s6 battery backup after 100% charge