I successfully upgraded to 10.14.1 this morning. The process was smooth and uneventful. Everything is working great.
The only single issue I'm now having is that, every 10-15 minutes or so, my network card drops all connectivity (both Internet and LAN). After about 20-30 seconds, connectivity is restored for another 10-15 minutes.
I tried updating AtherosE2200Ethernet.kext to version 2.2.2 (2.2.1 was in my Kexts/Other folder) but no change. I recall I had this issue a couple of years ago when I first built this Hackintosh. The only solution then was to downgrade AtherosE2200Ethernet.kext to version 1.0.0 or 1.0.1. This was a sub-optimal solution, however, as transfer speeds across the LAN to my NAS were significantly slower with the version 1 kexts.
Any thoughts on what this issue could be? (As an aside, I do currently have a TP-Link TG-3468 PCIe Gigabit LAN adapter sitting on my desk doing nothing. I'm not sure about its usefulness or compatibility, though, as references to this card on this site are quite old.)
Thanks for any insights.