Blinking (flickering) top left display corner after "wake up"

Hello,
I have a following problem. If the Screen goes to sleep mode and is "waken up" shortly after (within minutes) then for some 20 seconds the top left part of the display is blinking (flickering). Within the 20s this will gradually disappear. It did not happen when the MacBook was brand new, but started about half a year ago. I am wondering what is the reason and whether it can be repaired - my MacBook is still under warranty. I did not notice any change as I was updating the system.
I did not change or update any hardware components (RAM, HDD, etc) up to now.

I have this same problem but mine is in the middle of the monitor. Went to apple and they did a check and finally replaces me with a new screen. My advice is go to Apple and let them have a look.

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