iOS 7 was a complete interface and interactivity redesign and iOS 8, a complete functional upgrade. That led to some complaints that Apple was putting innovation ahead of platform stability. This followed years of complaints about iOS looking stale and missing features, of course, but fair enough. In the rush to get major changes out the door, especially when new products depend on them, there were some stumbles along the way.
iOS 9, anticipated for this fall, will focus more on stability. Recent updates like iOS 8.1.2 and iOS 8.1.3, however, and upcoming updates like the in-beta iOS 8.2 and iOS 8.3, and the currently internal iOS 8.4, make it clear Apple isn't waiting on the next version of iOS to address issues. They're already addressing them.