My phone Samsung A3 (2017) has sometimes strange noise like faint camera shutter sound, independently from which App is running.

There are similar questions but unanswered.

I have tried hard reset. During setup of phone after reset I heard the sound again!

Reset does not help apparently. and

Turning off all audio volume it still happens.

Flight mode does not help as well.

NFC is turn off and uninstalled (pm uninstall)

nothing appear on logcat when it happens.

Is it a hardware problem? malfunction of software? any info and workaround about it?

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