I had this issue. Not as bad as some, but bad enough. I got mine in Feb 2013. Upon visiting family recently I took the opportunity to visit the Nokia Care Point in Preston UK and they replaced the screen under warranty. Perfect job. Excellent care. This is not a common prob (first the chap had heard about it) but after my initial call to ensure he had the part in stock he researched my prob. This seems to have been a short term manufacturing issue now resolved. He did the repair in an hour and I have every confidence it won't come back. Fantastic support from Nokia. Sometimes things go wrong, I accept that. It's the quality of the response that counts and Nokia are excellent in that regard.