Hello, I bought my Iphone X Space Gray on release day. Some 6 weeks in, I notice that the bottom of the metal band - to the left of the charging port (looking down) had discoloured. A small area appeared to be glimmering blue / white. To me it looked the colours you'd expect to see if the band had got hot, like a slight rainbow effect... (I can't say I am aware of the phone getting hot however) I took it back to apple and they swapped it, apparently as a good-will gesture, despite the fact it was very noticeable, and had no signs of misuse. I should be feel grateful. The problem now is the replaced handset is also going the same way?! Ever so slightly I can see the beginning of a shadow/discolouration in the exact same place as the previous handset. I suspect that this will continue to get worse. My question is, has anybody else had this type of problem? I have searched online and nothing obvious come to light. I will try and attach a photograph of my new handset, where you may be able to just make out the slight discolouration beginning to start - to the left of the small screw. Thanks in advance, Carl One last thing, I use the Apple Leather Folio case, and on the other handset which I had swapped, if you removed the case, you could still see a shadow of the case on the metal band at the bottom, the shape of the case on the part of the metal band which isn't protected. Sadly I didn't photograph my previous iPhone to show you all.