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I was wrong, this is not solved, there is something in 25.7 that continues to cause the disconnect behavior; re-insertion of the network cable restores network connectivity.

I've disabled Intel Virtualization/VT-d (I'm sure that changes nothing) in the BIOS; I also disabled "Intel PAT"
[1] as part of the AMT configuration, the remaining AMT configuration had been previously disabled. So far >24 hours so good.

This "fixed" (honestly, I don't know what fixed it) another issue I had. I use Kea DHCP and it had stopped sending OFFER packets, or at least OFFER packets had stopped leaving the interface. I was able to re-enable Kea after disabling the PAT option in the BIOS.

I had found another post that clued me into Intel AMT causing issues with OFFER packets. I figured there might be a connection with the OFFER packets ceasing to leave the interface and my issue. I know not all traffic stopped as an active VPN connection on another client continued to work while any traffic on that client which was split-tunneled ceased to work.

As an aside, when I disabled the serial port in the BIOS, FreeBSD would no longer boot -- I would get an atrtc0: Warning: Couldn't map I/O [2] and the system would halt. Not a big deal to leave it enabled, I was simply disabling everything I could :-)

[1] https://www.intel.com/content/www/us/en/developer/topic-technology/platform-analysis-technology/overview.html

[2] https://lists.freebsd.org/archives/freebsd-amd64/2021-October/000036.html

The last thing I want to do is disable WiFi since it is also not needed. I should probably just pop the card out.

hw.igc.eee_setting is 1.

Yes, it is an unmanaged switch.

On 25.7.1_1 I'm having frequent (every few hours?) disconnects with my LAN-side NIC, an I226-LM. I'm using an ASRock Industrial NUC BOX 225-H (https://www.asrockind.com/en-gb/NUC%20BOX-225H). I can't find anything in the logs to indicate why it is disconnecting, only the physical removal/insertion messages. Performing the re-insertion restores network connectivity. The NIC is attached to a 2.5G unmanaged switch; I have tried different CAT-5E (1m) cables and ports on the switch.

The WAN interface, an I226-V, has not had any failures/disconnections.

Any thoughts at what logs to examine?