Squeaky, flexy case where black meets silver??

[erectorset]

I bought an iPhone this past Sunday. Just noticed last night that the case is squeaky and flexes if I squeeze it along the black plastic section.

I'm within the 14-day return window and I'm wondering if I should just take it back or if this is normal?

I'd really appreciate anyone's advice!

 

[pmade]

Mine does this occasionally, although I can't get it to do it now. If you can reproduce this on demand, I would recommend taking it back to the store and having someone look at it.