My wife’s iPad Air2 has started playing up after charging. The battery shows 100% and wakes as normal. The screen then blanks and the machine shows the battery Empty symbol and will not then show the home screen until the iPad is restarted. After restart, same thing happens, about one minute after starting up, it crashes and does the same thing. Plug charger in and restart and you can use it, but the battery shows fully charged. Does it go to iPad heaven or is there a fix?