So Apple has released iOS 9!
Which is... well, just give @iOS_Support a follow to see how it's going down.
So you might want to wait a bit for Apple to work out a hard fix for iOS 9!
At the moment, if you're encountering problems with iOS 9, Apple (or rather, @iOS_Support, as @Apple isn't an Apple account) is suggesting you try a hard reset.
And be nice to @iOS_Support, they're just trying to help.
Tweets and DMs with foul language or rudeness will be deleted and blocked. Come on, folks. We're volunteers. Sheesh!!— Apple Support (@iOS_Support) September 18, 2015