That's because your phone is banana shaped. No I jest. All new phones go through a bedding in phase.
Saw an article on Cnet regarding pressure tests in the new generation of phones. HTC M8 and iPhone6 came at the bottom (aluminium body) with the Samsung Note coming at the top. Like any new product there will be teething problems. The fact that only a few banana shaped have come to light after so many of them have been sold just proves they are not as bad as has been made out in the media.