I have NUC8i7BEH and LG 27UD88 connected via USB-C and Dell U2715H connected via HDMI. Works well (sleep, power on), no need to re-connect or anything.
I'm using Apple BT keyboard and mouse as well, with embedded NUC Intel BT. I have to use Linux workaround - boot to Linux to allow it to init BT properly (upload firmware) and then reboot to MacOS. BT works fine then as long as you don't poweroff the NUC (works fine after wake up from sleep). It...
I have been fighting the same issue for a while. Latest BIOS and Catalina 10.15.1 didn't help. What I found out worked for me to fix it was to change SMBIOS to Macmini8,1 and unplug all USB devices (namely tablet which I suspect was waking up NUC from sleep). It works fine after that.
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