I'm also have this problem with the right side and mine is bought on June the 7th. Sending it back for repair is something I'm not going to do at this point because it seems the chance is really high getting the same problem again even if they would replace the screen.

I thought mine wouldn't have this problem because the box had two Nokia seals on it and the down one was broken. I was hoping that Nokia opened it to upgrade the unit for this problem but unfortunately I was wrong. Still makes me wonder why they opened the box.