Originally Posted by MYC52002
Is there a way to narrow it down to the cable being the most likely issue before I have to run a new cable through the walls?
Yes. Take MBP to Ensemble and connect two together (probably along with router) via your Netgear switch with known good patch cables.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).