Creaking Xbox One S Controller (1 Week Old)

Dear Xbox community.

For years I have been a proud owner of a Wired Xbox 360 controller and since last week I decided to upgrade my old steed for a new Xbox One S Controller. When unpacked and pairing it (via an separated purchased Wireless for Windows USB dongle) I really loved
the old Xbox controller feel (after some using some brands I will not mention on this forum ) and enjoyed playing with it.

Now I do not play any fighting games, or soccers games (which are known for heavy button bashing and smashing), neither did I drop or bunked my controller against the concrete, but when playing Watch Dogs 2 I noticed a creaking sound, when having my index finger,
of my left hand, resting on the back of my new controller. When checking where the sound came from, I noticed that the plastic (of the left side panel) feels real bendy (do not really know how to explain it, but with the lightest force it bends towards my
left shoulder button). The right side panel does not have this issue and is real sturdy compared to the left one.

Now I do not want to argue about the smallest things, nor do I want to disassemble the controller's parts, but I am affraid that, due to the bendiness (is this a real word?), sooner or later there could be a bigger malfunction with my new controller (e.g.
buttons falling off).

So instead of going back and try to claim my customer warranty, I thought it was a better idea to ask it on this forums first. So are there people who had the same issues / sounds coming from their controllers, and are those still properly working or does this
mean that there is something faulty in my controller.

I hope someone understands what I just wrote and could help me out.

Thanks!

:)