This happened to me last year with an X. I just returned it and bought a new one. This is why I like to wait a month or two before purchasing the new phones.Just unpacked my iPhone XS Max 512... and the case is squeaking. If I gently "twist" it the phone gives me shoe type load squeaky noise. It is really annoying to pay 1500+ for the product and have such a poor quality. I'm going to return it back and be off market this year.