My iphone 6 plus randomly shut off and now it won't turn back on
My 6 plush randomly shut off today around 5:30 pm. I didn't show the normal signs of rebooting; the screen just turned black and it won't turn back on. I have tried pushing all the buttons and plugging it into the wall and the computer. The battery power was at around 65% when it stopped working.
iPhone 6 Plus