I finally got a moment to check on what was going on with the secondary physical server and it appears something triggered some kind of bug in which the network interface started resetting randomly and would come back up at 100Mbps before dying again.
I don’t see an actual reason for this in the system logs, which is very puzzling…but after a system reboot and sending a tech to look at the server’s networking cable just to be sure- it appears the box is running okay again.
This means that we will need to keep an eye on this box and make sure we catch on to future possible errors before they take the system out.