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Alright!
The result from my little surgery:

If you remove your battery hatch, you will notice seven screws. The two once in the middle on both long sides.
They are causing inner tension, this...

Yhea, I just got my phone 3 days ago. Noticed the same thing, the click noise comes from the middle part on both sides. Seems like its getting a bit looser the latest day.

Hopefully it doesn't...