[Help] Problem download data game while my S7 edge is in stanby!!!

Hi!!!
Like the title said while im trying to download certain game for my S7 edge and i put my phone in stanby
it stop to download it....i can download only if my phone is NOT in stanby why?
is a common problem or is only my problem? its strange because is activate by default activation date in background
so someone can help me pls? im frustrated because is a new phone......>.<

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