Already did that after the second freeze since I knew they would ask at the Apple Store if I brought it in. So it did it again even as a new iPad, so I restored my old backup since it would have taken a long time to reinstall all my apps and redo all my configuration.
My only other suggestion is fully reflash iOS 9.1 image using IPSW download and iTunes if you haven't already done so.
http://www.redmondpie.com/download-ios-9.1-links-for-iphone-ipad-ipod-touch-ipsw/