@RF_Dude interesting post. Made me think the issue is actually the isolation transformers used to decouple the ethernet link from the phy/mac chip device inside the AP that does the conversion...

@jettamc22 Ok, there's one last thing you can try: https://www.tp-link.com/us/support/faq/3186/ Oh, and a really really long shot, it's not entirely unheard of for contacts inside the ethernet jack...

@saratoga Interesting. So you are running your devices in standalone, and presumably have an unmanaged L2 switch between the router and APs? Have you configured any VLANs, say for your SSIDs?

@glock-kai Just don't enable VLANs on them (which will tag packets) and they will work like a dumb switch on the default VLAN of the AP.

@Kimijoe Then my guess is the power circuit in the AP is fried which is causing the adapter to shutdown to protect itself. Power surges are bad and this is not unheard of. Sorry, but it is probably...

Have you tried defaulting the AP by inserting a pin in the hole next to the ethernet jack and depressing the reset switch for 15s or so? AP must be powered up when you do this.