Note 9 camera makes a relly quiet click sound sometimes when focusing and swapping from selfie to main cam

[Live1]

Is this normal my new note 9 makes a tiny barely audible click or tick sound when its focusing sometimes or perhaps  it's trying to get more light in ?and  it does that same tiny click sound if you change from selfie  cam to main cam or change mode. Is this normal why does it do that is is something to do with the variable arputure?. I'm a newbie so sorry if this has been answered before but I cant find anything that mentions that tiny click sound when focusing or I'm assuming it's trying to get more light if it's normal or I have a defective phone.thanks  guys

[SaudA]

Hi @Live1, is the sound similar to the one you hear when you shake your phone a bit, or is this different? Is there any damage on the phone at all?