While my PG279Q was under warranty, I decided to get the firmware update that is noted in this thread:
https://rog.asus.com/forum/showthread.php?87380-Firmware-Update-for-ROG-SWIFT-PG279QMy monitor was working fine except I would have to power cycle it every once in awhile to clear up the pixel inversion issues. I knew shipping the monitor back would be kind of a pain but figured it would be worth it to have the monitor completely working.
I filed an RMA and shipped the monitor back so it arrived at Asus on 11/13. I received an email stating they were going to send me a replacement instead of a repair but it didn't ship until the 11/28. I received it on 12/5 and it has backlight have a huge irregular bright spot. I have contacted support multiple times now working to get it repaired or replaced. I am unable to open another RMA because the new S/N is tied to the first RMA so won't let me create another using the online form and the support representatives aren't able to either.
If you have a good panel on your PG279Q, I wouldn't sent it back or you risk getting a defective one in return that you will be stuck with.
Update: I was able to get an RMA filed and the defective monitor is on its way back.