Same issue. Genius gave me two replacement phones, same issue on both. Very annoying for the price.
Has anyone fixed this by tightening the screws?
Nah once you get a screw driver in there you're going to crack the paint and it's scratch city.
A phone that's over 1k should not have to be tightened.
I went through a few X replacements in the last week because mh nearly perfect original phone died and that started me into the return lottery. If it creaks out of the box it will always creak! My current X which was replaced last night doesn't make any noise, creaks, or pops...fingers crossed it stays that way!