Could be, but I only took my new phone out of its package yesterday, and right after the first assembly, the screen noise/give-in was there on the lower right portion. So mine's is not a wear issue, since its brand new. It sure is a factory defect.Got the same problem.
Tomorrow i am gonna switch back covers and see if it is the issue.
I think when you take the back cover of to many times the right side will show this problem.
Greetz.