It's a well-known issue which appears to affect all Z490 chipets with the Intel I225-V 2.5Gbe NIC, not just Asus
Basically the latest driver from Intel, and which is available from most of the motherboard manufacturer sites, has a bug whereby the NIC dies on a system reboot.
The status will show cable/media disconnected and there'll be no link or activity lights on the socket.
This only happens after a soft reboot, powering off and on again will not show the problem.
You can fix it by disabling and re-enabling the interface.
The solution is to roll back the driver to an earlier version. At present the one on Windows Update (126.96.36.199) is fine.
Uninstall the NIC from device manager and opt to remove the driver too.
Reboot and allow Windows Update to locate the driver (using Wifi or an alternate NIC for connectivity).
This is being discussed in various forums but could really do with being highlighted by a more prominent site/channel like this one to give Intel a kick up the backside to get it sorted.
I tried that, but it didn't work. I start "install" as admin and get the following message after 2 Enter:
Intel(R) Ethernet NVM Update Tool
NVMUpdate version 188.8.131.52
Copyright (C) 2013 - 2020 Intel Corporation.
Error: Unknown keyword '.\FXVL_15F3_ASUS.binC.\FXVL_15F3_ASUS.binU.\FXVL_15F3_ASUS.binR.\FXVL_15F3_ASUS.binR.\FXVL_15F3_ASUS.binE.\FXVL_15F3_ASUS.binN.\FXVL_15F3_ASUS.binT.\FXVL_15F3_ASUS.bin .\FXVL_15F3_ASUS.binF.\FXVL_15F3_ASUS.binA.\FXVL_15F3_ASUS.binM.\FXVL_15F3_ASUS.binI.\FXVL_15F3_ASUS.binL.\FXVL_15F3_ASUS.binY.\FXVL_15F3_ASUS.bin' in line 1.
Error: Cannot find markup 'CONFIG VERSION' with correct format.
Error: Cannot parse CONFIG VERSION parameter due to the mistakes in configuration file.
Das Muster für den regulären Ausdruck ".\FXVL_15F3_ASUS.bin" ist ungültig.
In Zeile:1 Zeichen:1
+ (gc config_i225.txt) -replace '.\FXVL_15F3_ASUS.bin','NVM_VERSION' | ...
+ CategoryInfo : InvalidOperation: (.\FXVL_15F3_ASUS.bin:String) , RuntimeException
+ FullyQualifiedErrorId : InvalidRegularExpression
PS D:\Temp\Backup Apex\Treiber\I225V_Intel_Gigabit_Ethernet_Driver_V184.108.40.206_WIN10_64-bit\I225V_End_User_FW_UPDATE\I225V_End_User\win64e>
OS: WIN 10 Version 2004 (Build 19041.264)
I managed to update the firmware wiht the run intall.bat as admin on my z490-g, but for me to 220.127.116.11 is the only stable NIC driver for now.