screen flicker upon restart

My phone was acting up so I turned it off and turned it back on after a second or two. After the boot animation was done, the screen went gray and I could see the Google logo flickering faintly in the background. I turned of the screen and turned it back on and my normal lock screen showed up but the flickering Google thing was still there. It went away after a minute or two and I didn't get a chance to get a pic but it was really weird... has this happened to anyone else?
btw my N4 is completely stock and not rooted.

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