problem on power key sm-j120f

hi guys,
i have a samsung galaxy j1 2016 ( SM-J120F ), sometimes the power key works normally then after a minutes using the phone i get the problem of power key stops working! if i removed the battery and turning on the phone, the power key gets back to work fine ! i'm confusing, is it a software problem or hardware, ( i tried flashing the phone but i'm still suffering ) !

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