Is it on anything displayed or just on Grid like backgrounds?
With the matte display, I have seen where on some lines that are of a grey color, can flicker and what not. People have reported that changing the refresh rate to 100Hz (you have to make a "custom resolution" in the Nvidia display control panel) will eliminate the problem.
If its occuring all the time on any background, I would say its defective. I went from a G74 with Glossy back to this G750 and the difference is minimal, basically one is just Matte and the other is Glossy. To me, Asus got it pretty close to almost the same quality in the screens. You can see a comparison here:
http://rog.asus.com/forum/showthread.php?39873-G74Sx-Glossy-Display-vs-G750JH-Matte-You-decide.&coun...If you were within the first 30 days, I would be tempted to get it replaced at the reseller which should limit the delay in a replacement. Goodluck!
(ROG has simply become too expensive compared to the competition with same specs... 😞 )
MSI GE75 Raider 10SGS - i7 10750H - RTX 2080 Super - 32GB Ram - 1TB WD NVMe - 2TB 960 EVO - 300Hz 17inch Display
RETIRED: ALIENWARE R17 R5 - i7 8750H - GTX 1070 @ 1.9Ghz - 16GB DDR4 - NVMe 970 EVO 1TB - SSD 960 EVO 1TB
SOLD: ASUS G703VI-XH74K, RETIRED: ASUS G752VY-DH72, RETIRED: ASUS G750JH DB71 , RETIRED:ASUS G74Sx DH72