Freeze at sleeping screen

A

AC Question

Hello.. i have a problem with my samsung a5 2017.. when the screen goes black(when its not use) or when i lock it and goes to black screen or sleeping screen, sometimes its freeze and cant be move.. so i have to restart it with power and volume button.. but when i use it.. it doesnt have any problem.. so i have to play spotify all time so the screen dont go black or sleep so i can unlock my phone without need to restart it.. any solution for this problem? Thanks
 

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