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I’ve been able to get most of my iPhones to do this. Since I don’t usually squeeze my iPhones when I’m using them this has never bothered me or happened to me outside of reading threads like this. I never vice grip my phone during normal usage.
 
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Its not from the speaker. Its mechanical/hardware issue. its seems to be that the back glass and the front glass is not glued properly.

Video from a guy with an iPhone Xs Max. I have much louder noise than this, and my screen is also popping not only the backglass.

Woah!

Nope, I don’t have that at all on my 11 Pro Max

Have tried the back and the front as well as doing both sides at the same time, it’s solid, no noise.
 
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