title: iOS 9 and 10 - App can't be started after a while since installation
body: <p>After a while – which might have been a few weeks or months earlier, but now is more like hours or sometimes even minutes – I can no longer launch the app. All I get is one or a few sessions of app working normally after the installation, then it gets into this state and I can't do anything with it except for delete and reinstall. When I tap the app icon, I get a black screen for 15-25 seconds, then the app crashes.</p>
  
  <p>Here is an excerpt from the log I got via XCode, and more logs are attached:</p>
  
  <blockquote>
    <p>Fatal error generating launch image for com.my.app.name:
    Error Domain=UILaunchStoryboardErrorDomain Code=2 "Error loading:
    [ setValue:forUndefinedKey:]: this class is not
    key value coding-compliant for the key delegate."
    UserInfo={UILaunchStoryboardClientBundleIdentifier=com.axialexchange.ah-newton,
    NSLocalizedDescription=Error loading: [
    setValue:forUndefinedKey:]: this class is not key value
    coding-compliant for the key delegate.}</p>
  </blockquote>
  
  <p>Observations:
  When viewing it in the list of recent apps (i.e. double-press the Home button), the app looks fine, and I've seen different screens in different apps there, so it doesn't look like it matters what screen I left the app on.
  Reproducible on iPhone 5 / iOS 10.1.1 and iPad 2 / iOS 9.3.5.
  Never seen it on iPhone 5S /iOS 8.4.1.
  Restarting the device doesn't help.</p>