The back panel of my icon squeaks when pressed with fingers. I'm just curious if this is a thing for all icons or just mine. It's quite annoying but then again, I'm very anal about small things.
It happens on my Lumia 520. Icon has a plastic body or an aluminium one. Shouldn't happen with aluminium bodies I suppose. Maybe try opening your back cover and see if there is lots of space betwwen battery and back cover. That space causes squeaking. (Also prevents damage to battery in a fall)