Hi, when unlocking my N9 yesterday I saw 2 very fine black lines on my screen. After about 5 minutes of using my N9 they faded away until I almost couldn't see them anymore, so I tought the problem fixed itself.
But... when I unlocked the device some time later the lines were back again, and again they faded away after some time of use.
Today the problem is still there. Anyone else had the same problem with their N9. It doesn't look like the nasty screen rot that I noticed in other threads.
I'll bring it in under guarantee, but I'm afraid they'll just send it back unfixed as the lines fade away after some minutes of use.

I have attached some pictures to the topic, taken yesterday and today.