My Galaxy s6 has been acting up for the last week . I will be using it and the screen will go black and a 1/2 inch wide green light will be flashing about 1inch from the bottom. I carried it to a shop they took it apart unhooked the battery and the Lcd hooked them back up and it worked for 2 days and done the same thing. I took it apart myself this time did the same thing the shop done and it's working again. Any clue as to what is going on?