I have the same problem since the first day. I think its something to do with the new in cell display technology. Its getting worse day by day, especially when am on a call. Have never ever replaced any Apple product till now, I feel really bad walking into Apple Store and asking for a new one :-(. But got no other option. I hope Apple finds out the real issue with it soon. Thanks for sharing. Cheers.
Glad to hear I am not alone. I agree part of me is thinking of replacing this phone with a new one when they are back in stock. However, I did not purchase Apple Care but got coverage through my wireless provider. I never thought I would have to inquire about it so soon.