Click Sound on iphone 6 glass/screen!

Hello guys! Just have one little problem and wondering if anybody around here might experienced the same!

Last few days I've noticed when I press the bottom of the glass on my iphone6, I can hear and feel a click, like the glass it's popt out and when you press you kinda feel how it goes back in place. The phone is working perfectly, no issues, but it's annoying that click, I would like to fix it.

My first idea was to open the phone and close it, probably will fix the problem, probably will place the screen in its place. do you guys know if I lose the warranty if I just open those two screws and then close them.

Thanks a lot,

Alex