This Ethernet Expansion Cards do seem to be very delicate.
I can truly confirm that all my Ethernet switches within my lab environments are not the issue as I have many desktops, laptops, Dongles, MacBook Pros, Mac Minis, Servers, and docking stations working without any issue.
I am getting greater success to always do a reboot after I insert the Expansion Card to a new slot – I try to the rear USB C ports (right now as I am writing this post the card is on the left side back port).
I am seeing the card go offline and online periodically. I don’t have that experience with any other Ethernet device.
I have swapped the two cards between my original Frame work laptop (11th Generation I received in DEC 2021) and the new 12th Gen I received in September 2022. The experience is the same.
I am using POP!_OS 22.04 using kernel 5.19.0-76051900 on both systems.
No matter the configuration of the card or laptop the experience is the same where I see periodic drop and start of the network adapter.
On both laptops the Ethernet Expansion Card is recognized as USB Ethernet device (image attached from the Framework 11-gen as both cards do not work as well as the other laptop).
The PCI Ethernet device is my Sonnet SOLO10G SFP+ device – a network for a TrueNas server.
I am not sure if I am going to return 1 or both.