I just got a new iPad mini 2 that AT&T gave me for free for getting a new iPhone. Only had both of them for a lil over two weeks. The other day I decided to beta test the new version of iOS 10.3. Now for some reason every time I try to charge my iPad it works for a few minutes sometimes less. Then an error pops up saying this device is not supported and it stops charging. I unplug it and plug it back in and it works again for a few min and then the same thing happens. Not sure if there is anything I can do to fix this. I know it's not the charger cause it works on my iPhone and my other charger does the same thing when I use it with my iPad. Any thoughts on how to fix this or am I gonna have to downgrade back to 10.2.1. If that's what I have to do, how do I downgrade ?