I'm using Samsung s5 for more than 2 years. Everything was fine until my screen started to work not properly. My screen always stays black, then I press button on the left side to unlock my phone, screen turns on for 1s ant then screen is black again. I thought maybe my screen is broken or something, but then I connect to charge after 2 min everything is fine, I can disconnect and use it properly, screen works fine. Then I lock my screen, after 10-15min, problem returns. Does anyone had this problem?