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I have this problem

https://forums.macrumors.com/thread...buzzing-sounds-from-earpiece-speaker.2087816/

It is known if beta 11.2.5 solves the problem?
I have changed my iphone 2 times and they all have the same problem, it is more or less visible but it happens in all of them.

Does Apple know that this problem exists? I do not know how to communicate it so they can know

I'm sure Apple is aware of the issue. But you can always submit technical feedback to them with a ticket. Or call Apple directly and have them Note the issue, then they send the alleged problem to be investigated or documented.
 
It has to do with the power management unit I think. You kinda have to keep replacing the phone till you find one without the issue.
 

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