I have this monitor hucked up to DP (back of monitor) to mini display port via a OWC Thunberbolt 3 hub to a Razor 15 Advanced Thunderbolt cable (using the Thunderbolt port).
When the system goes into sleep mode the monitor does a flip and flickers. It will only stop if I pull out the Thunderbolt cable to the OWC Thunderbolt 3 Hub and then reinsert.
I've changed cables, different ports and only seems to work when the above is done. It also does the same if using USB-C. HDMI - doesn't give me the framerate I'm look for. Interestingly when I use PIP it doesn't seem to do this - only in full screen mode.
I have all the latest drivers. Monitor firmware version - m-J8943CGAA-1006.2.