It’s possible the previous admin scheduled a daily image deployment that contains a broken NIC driver. (check scheduled tasks)
The second possibility is a snapin that is done every day. (check snapins)
Check fog client hostname settings
Some devices have somewhat buggy UEFI firmware, especially with network boot. BIOS update might help.
@Tom-Elliott yeah i mean that. It’s a good idea but i Think that is a good idea too to have the current Page too as a sublink on fog settings. Changing the background color instead of erasing when the node is offline. To have a panorama of the system. I Dong unos if i explain correctly