Question Top of screen black flickering / blinking

[Voilynneas]

I bought the system a week ago and i just noticed if G-sync on (not sure because of G-sync but if i disable seems fine) and low resolution randomly appear that flickers. (nature resolution seems fine to but not sure to).

PROCESSOR:Intel Core i9-9900K
GPU: ASUS DUAL 2080 TI
MOTHERBOARD: ASUS PRIME Z390A
RAM: G.SKILL 3000 MHZ
MONITOR: AOC g2790px

View: https://www.youtube.com/watch?v=3imEv2OFZGo&feature=youtu.be

 

[kerberos_20]

defective monitor, if its shiny new, RMA it

 

[Voilynneas]

defective monitor, if its shiny new, RMA it

Hi Thank you for your answer,
This monitor ist not support G-sync officaly so its mean they dont want to take under warranty. I just want to be sure is this just G-sync problem or another else.