wow new phone again 

good they change 1 to 1..
sometimes they won't to that

got the new replacement on the spot?

which service centre u went?

sum1 did say before that those units doing exchange in SC are mostly refurbished units. apparently they fix the problematic units (like for e.g red-tint) then put on new plastic films and reseal the box..

may I know which SC you went?

Mine is sent for process for 1 to 1 exchange, need to wait 1 to 2 weeks

seems like S8/+ has quite a few hardware issues, dont know its because of the unoptimized software between the OS and apps or memang hardware problem..

These are the prevalent issues so far (can be seen on reddit and xda of many users complaining about it):
1) S8/+ glass (front and back) very easy to pick up scratches compared to previous generations.
2) S8/+ fingerprint sensor also gets scratched easily (not glass)
3) S8/+ red-tint displays
4) S8/+ camera's OIS gets stuck quite often, have to shake the phone quite roughly in order to "unstuck" it.
5) S8/+ LED dying out of a sudden issue
6) S8/+ random sounds cuts from the speakers
7) S8/+ randomly rebooting.
8) S8/+ random vibrations after unlocking the phone via hard-pressing home button. (like it doesnt register immediately when you're pressing the home button to unlock, so the vibration comes later after u unlock the phone and touch anywhere on the screen)

then there's a plethora of software bugs between the OS and certain apps.
1) edge lighting not working with certain apps
2) facebook zooming in/out the wallpaper when exit the app
3) whatsapp LED notifications not working sometimes
4) whatsapp images received when open it, its zoomed a little.