I installed Asus Prime Z370-A about a week ago. During this time I've experienced this maybe 10 times: after reboot or resume from sleep the network systray icon has the exclamation mark and it says "Unidentified network". (It doesn't resolve ever by itself, or at least not in minutes.) Then I go to change adapter options / Disable Ethernet. And back to Enable. Then it usually starts working. Sometimes I have to do the Disable+Enable twice. The problem only occurs after reboot or resume from sleep. My ethernet driver is the one at
https://www.asus.com/us/Motherboards/PRIME-Z370-A/HelpDesk_Download/ (Intel LAN driver v12.17.10.7).
What's going on? My previous system (almost the same environment, only motherboard changed) never had this problem.