[teedog]

Hmmm, next thing to try, if you haven’t already, is swap Display port connections with one of the other monitors. Try to rule out a problem with the video/monitor card display port. You can also test out your cable this way

Also, test both HDMI ports with the appropriate HDMI 2.1 cable. See if the problem persists. This will rule out any issues with the physical DisplayPort on your monitor.

Last time I checked, Asus makes you pay for shipping for warranty service. From the US, that’s approximately $40. May be different depending on location. I hope you don’t have to do this.