Iphone 7+ screen like crack sound

[Kadir-1]

Hello guys i have iphone 7+ and j realised when i press the screen with two fingers top/left bottom or top it makes some noises like its cracke.Can you help me whats that because im worried.Any help is appreciated

 

[nzalog]

Probably not supposed to do that, iPhone 7+ is still under warranty from apple. Take it to the nearest apple store.

 

[Kadir-1]

No i don't do that but once i realized and yes ill take it to apple store and see whats the problem. Thank you!