Hello, Bit of an odd one - it's happened over these past two days now. My battery was at about 35%, and the iPhone just switches itself off, no 'low battery' warning or anything. When I hit the power button to try and get back on, it displays the battery up top of the screen, with a red juice bar, and the Apple connector underneath it. Once I'm home, and connect the cable, the iPhone boots straight up, and shows a healthy-ish 35% battery. Does anyone know what could be causing this? I have been using the camera a lot these past few days, but nothing too crazy. iPhone 6s, running iOS 10.1.1. Thanks!