strange noise (faint camera shutter sound) on Samsung A3 (2017)

[a3gala2017]

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

It happens in safe mode.

I have tried hard reset. Just during phone setup after reset it happens again!

Reset does not help apparently. and

Turning off all audio volume does not help.

Flight mode does not help as well.

Turning off NFC does not help.

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

[BandOfBrothers]

As your obviously a little concerned and sound to have also tried all the troubleshooting tips you can try I'd suggest to let a Samsung Experience Store or Samsung Service Centre have hands on to check @a3gala2017