Using this image: usb-9.0-40G-rhcsa9.0-mbr-r2022120916.img
My lab tech reports this:
This problem has been repaired (it wasn't anything to do with Red Hat):
There was a bad cable in the wall, causing the network connection to operate at 100mbit/sec. instead of 1Gbit/sec. -- the speed it should.
It was repaired, and now everything is working great!