I'm experiencing the exact same problem. Have you found out why the monitor is doing this? I'm thinking about sending it back...

They have already replaced one of these monitors for me, but the new one produces the same error.

having the same Problem, did everything Dell support told me to do, I even switched PC all cable etc. When playing games i get random black screen.

2, is not working.

my solution: HDR mode is full off (monitor menu and windows)

HDR is not working in AW2723DF.. 

I have the same problem. It's not the cable. I have found out 2 solutions.
1. Change the color depth to 10bit. (not 8bit)
2. Do not turn on your computer with 240hz. (239hz, 280hz and other refresh rate is OK)

I have tried your solution. Turn off both monitor menu and windows HDR, but unfortunately it does not work. This problem is so disappointing.

I found a new solution. Turn off "DSC" in the monitor menu. (display menu, above the PIP/PBP)

Hi, same issue here..i have tried evrything..when DSC was on i had the black screen, even in gaming was poping me out back to desktop..i turned DSC OFF now i do not have the black screen anymore but still time to time kicking me back to desktop while in game..im thinking to return the monitor and try different one 

Same exact issue as well, getting a replacement. Have had 2 faulty ones and wont give refund. For a flagship product this is disgusting. So many people having the same issue and they have not addressed the situation at all.