The attached photo shows the problem, which only occurs after the phone has been in my jean pocket for about 10 minutes. If I then leave the phone out of my pocket for another 10 minutes or so, the problem goes away all by itself. The screen is not cracked, chipped or deformed in anyway and the device works ok.
I've asked for a replacement phone, but am concerned the new one will do just the same. Any thoughts or similar experiences from anyone?