This sounds very similar to https://community.tp-link.com/en/business/forum/topic/574182 issue I had with my 225-outdoor. I eventually got it working by: 1) Revert oc200 to backup that still had it...

@Fae Any ideas before I get the ladder out and try and reset it? It shows as connected if I reboot it, but then the heartbeat gets missed and then goes to disconnected. Clients can still connect and...

@btx I got excited for a minute because when I removed the POE injector it said "connected", but then later "HEARTBEAT MISSED" and now disconnected. But still pingable, I can still access the web UI...

@btx Sorry, I haven't tried that yet because its high up and it will be a pain, but I will try that soon.

Another interesting thing is that when I leave it in this "Disconnected" state, the oc200 says last seen "Jul 26, 2022 09:22:47 am" so it is seeing it occasionally.

@Somnus @btx I have a very simple network setup here. No extra subnets or vlans or anything. Just an unmanaged TL-SG1218MP switch that connects everything. One wringle is that my eap225-outdoor...