Apple has released an iOS update today, iOS 8.1.2 which fixes a few bugs and solves a pretty annoying issue which involved disappearing ringtones. The software is currently rolling our OTA to Apple devices. The update can be installed on iPhone 6, iPhone 6 Plus, iPhone 5s, iPhone 5c, iPhone 5, iPhone 4s, iPad Air, iPad mini with Retina display, iPad mini, iPad (third and fourth generation), iPad 2 and fifth generation iPod touch.
Be on the lookout for the update to arrive soon. You can always check for an update manually by heading to Settings > General > Software Update on your iDevice.