iPhone 5 Display Glitch (Extreme Edition)

This is happening from time to time since the 6.0.1 update that fixed the glitches on the keyboard when I'm going to the lockscreen after a longer time of not using my iPhone. I finally managed to catch it on video:

what do you guys think could be the reason for this more than awkward glitches?

by the way, the touchscreen is fully functional during this crazy pixel dance...