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julienvd93If the sound from the speakers is enough to make the button vibrate, it still seems really loose to me.
It is IP65/68, it takes fairly harsh conditions for condensation to appear, especially if it is not at startup, in use this CPU should avoid having condensation except in extreme cases.
I don't know your environment but I think you can compare with other phones, do you have a Rog 2?, it has no protection, it should be easy.
It's 2 days old?, loose volume button and fog on the lens, in theory no problem sending it back, I think that in your place I wouldn't even ask myself the question