Hi @smb55, welcome to the Community!
It seems indeed like not a Qubes-specific problem. Sys-net works more or less like an ordinary Fedora with the ethernet hardware. You should be able to find information about your problem on the Fedora (or general Linux) forums.
Some people read this forum via email and do not receive any edits done after 10 minutes. For this reason, it would be better to make a new post next tmie.
By the way, would it be possible that you attach an HCL report for your hardware, to help other users?