so last night my phone just all the sudden just black and power button was unresponsive. I plugged it into my charger and my main menu screen appeared. My battery was at 84 percent so i know the battery wasn't dead. The only way i am able to turn my phone on now is by the double tap function. I have done system updates and such and am still not able to figure out this issue. Hopefully someone from here can help me out.