I have two 8411 that pass a lot of traffic and have a lot of configs. They both were upgraded and operational like usual.

Ah, see yeah, I have a bunch of 6xx model APs.

I just tested this and got the same thing... I wonder if the AP firmware needs to be updated to report back to the controller. @Vincent-TP

Did you enable it in the SSID? Do you have a Omada AP?

Look at the logging server post i made above. but you can still have a wireless loop if you Decos are programmed to fail over to other Decos.

Enable remote logging within your site. Configure a local loggins server. Then point the logging to that server. check more detail logs. This will show you an error before the network locks up. This...