iphone 5 turns off randomly, now will not start, will not hard reboot, will not restore in itunes (error 4014) all since latest update
My iphone 5 has started to randomly power down, since last update a few weeks ago. Last week it would not restart until plugged into a power device, when it restarted with battery still showing over 80% which was where it was when it decided to shut down. Now it has shut down again and will not restart, and will not respond to a hard reboot (power on and home button together). It does not respond when plugged into a recharge source. When connected into itunes it downloads software for a few minutes, then reports that it cannot resotre due to unknown error (4014).
iPhone 5, iOS 8.3