At some point recently my Windows 10 computer developed an issue where the Ethernet network adapter would seemingly disappear after waking up from sleep. I would then have no network connection until restarting the machine.
The symptom of this issue was that after waking from sleep, “Network Connections” would be empty:
Looking in “Device Manager” would show that the physical device does indeed still exist, but that it has been unable to start:
While there are various suggestions online, the one that worked for me was disabling hibernation mode, by opening a command prompt as administrator and running:
powercfg -h off
I found this solution following this comment on reddit, which mentions that a recent Windows update made “hybrid shutdown (half sleep/half shutdown)” the default, which prompted a search leading to this answer.