I am using the latest firmware on all devices.
Balance One Core - 8.1.1b02 build 5015
AP One AX - 3.8.1 build 4906
AP One Mini AC - 3.6.2b01 build 1920
I am still digging, but it looks like if I can get the APs to generate traffic, they stay accessible via IP. What is even weirder still is that the Balance One seems to be able to ping the IP of the AP through the LAN (System-Ping), but another device on the LAN cannot ping it. That makes remote support kind of difficult since the router is able to do things that other clients cannot. I will do the test again and do some screen grabs if time permits.
When I woke up this morning, one of the APs has lost its connectivity to the mesh. I guess I will need to use the “turn radio off if no network connection” option. I will use my other thread Wifi Mesh and Balance One AP Controller / Channel scanning - #3 by jmjones to try and keep this one from getting cluttered.