Why does my lockscreen disappear after a while?

One example that occurred this problem:
I was listening to music and, of course, I put it on sleep. I wanted to look up something up when as I pressed the sleep button to waken the device, my lockscreen isn't there. The only thing you can see on the screen is the lockscreen wallpaper. No "Slide to Unlock", no clock, no tabs where you can slide up or down the Notification and Control Centres. Nothing.
Is this a bug on the new iOS 7.1? Or is this fixable?

Try:
- Reset the iOS device. Nothing will be lost       
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears. Done
- Reset all settings                  
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:                                                
iOS: How to back up                                                                                     
- Restore to factory settings/new iOS device.                     
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
  Apple Retail Store - Genius Bar

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