I was under the impression that Nexus devices are solid-built and as sturdy as iPads. At least that was my impression when I thoroughly "inspected" a Nexus 7 (2013, black) a while ago in a store. However, the one I got the other day squeaks if I press/hold along the sides (especially) in the middle, or press fingers lightly at the back. I think it was manufactured in March or April, and it's white (also, the white back part feels different from the black one I checked out in the store -- I think the black one was more solid on the back, whereas this one feels more "plastic"). Is this normal, or just a bad batch (or white vs. black model differences)? It feels a bit like MemoPad in this regard...