Do not update to MacOS Sierra or iOS 10
We've encountered some stability issues with Mac OS X Sierra and iOS 10.
Please hold off on updating until we hear back about the bug report we've filed.
If you need to revert an iPad to iOS 9, there are literally over 5-1/2 million answers if you search, but this a good one:
Our apologies for the inconvenience, but unfortunately these kinds of issues appear in OS updates. We hope to have updated information soon.