Mac Studio Ethernet Port Restricting Speeds

On my Apple M1 Ultra I have had a 10gb/s cat 6 connection to my server that has always provided full speed. Suddenly that same connection is being capped at 100mb/s, making it pretty much unusable for our needs.

I tested the cable on another machine and got full speed. I tested the cable on the same machine while using a 1gb/s USB-C adapter and was able to get the full 1gb/s speeds. It seems the issue is the ethernet port itself which is now operating with a maximum of 100mb/s.

I have tried manually adjusting speed / MTU in network settings to no avail. I have tried the usual reboots and such, and nothing has worked. Reading other similar issues on the forum I found one person who mentioned the same problem after a power surge, and we have had electric work done in our office this weekend, but every other machine on the server is still operating at full speeds.

Wondering if this is just faulty hardware that needs to be replaced, or if there's a potential solution to this problem without having to send the machine in. Any suggestions are welcome. Thank you.