Hi,
It looks like your board has I225v Ethernet controller. There are 3 revisions of the chip - B1, B2 and B3. B1 and B2 are both faulty and drop connection like that, lose packets etc. B3 is fixed. Just search for I225 Ethernet issues and you will find a lot of people with this problem.
E.g. Intel community board:
https://community.intel.com/t5/Ethe...WldLfDEyNTM0NjZ8U1VCU0NSSVBUSU9OU3xoSw#M23783
Your board likely has either B1 or B2 revision - you can check in the device manager, in the device name. The number in parentheses identifies the revision.
The semi-fix is to update the firmware to version 1.45 and then use drivers that work with it (Look on Asus site). I did it on my Z490 Aorus Master and at least it seems I don't get disconnects but I still have the packet loss. Also, part of the fix is just limiting the bandwidth from 2.5 to 1 Gbps, so not ideal. Just see the Intel boards, how many people are trying to pressure Intel into doing something with it. This can't be fully fixed as this is a hardware problem but maybe they will mitigate it further. Most z490 boards with Intel NIC have the faulty controller. Even if you buy a new board today, chances are you will still get the B1/B2 chip. They should have recalled all the boards but of course did not do it...
