Not sure where to post this, but it began after an upgrade to 9.2.1 - I think - so I will start here. I charge my iPad Mini/Retina overnight. Twice in the past two weeks or so, when I boot it up in the morning it displays an empty battery icon instead of booting. I then have to force it to recognize the 100% charge, by plugging it in again, doing a hard reset... and it is very reluctant to do so. Is this a known issue with 9 and is there a fix? ... I'm afraid it won't recover one of these times and I use it a great deal. ... Thanks!