Some iPhone 5s users have discovered a rather unwelcome Easter egg on their new phones: a "blue screen of death."Several 5s users on Apple's support forums say the bug crops up in iOS 7 when they double-tap the iPhone's Home button to switch from an iWork app. As this YouTube video shows, the phone's screen briefly flashes to blue, and the phone then restarts.True to Apple form, it is a rather clean and simple blue screen, a far cry from the cluttered Windows error messages of yesteryear.Fortunately, a couple of possible workarounds have been discovered: Users can either exit back to their documents list before opening the app switcher, or they can disable iCloud syncing of iWork data.iOS 7 is a major overhaul of Apple's mobile operating system, so a few bugs are
