title: Simulator/device does not sync with iCloud
body: <p>From time to time I'm getting errors that my iOS 8 device or simulator will sometimes not sync with iCloud (Drive). The following message appears (multiple times) in the output log:</p>
  
  <blockquote>
    <p>CoreData: iCloud: Error: failed to receive initial sync notification
    call back in 90 seconds</p>
  </blockquote>
  
  <p>Only reinstalling the app helps.
  Has anyone experienced the same issue or got some information about this?</p>