ASUS Blue Cave drops WAN connection to NETGEAR CL500

I purchased an ASUS Blue Cave router over a year ago when they dropped below $100 on sale, as I already had a couple of T-Mobile Asus routers converted to AC68U's running AI Mesh and wanted a newer/better front end for the system. So now I have the Blue Cave and 3 AC68U conversions running as mesh nodes - which work the majority of the time.

However, I started having some issues with the Blue Cave about 6 months ago where it just decided it wouldn't broadcast WiFi at all. In frustration...

ASUS Blue Cave drops WAN connection to NETGEAR CL500