.... having several powerline devices, two of them are WPA 4220 and WPA4530, ... they worked fine until I start add wifi devices (IOT), when a realized that accept only 16 wifi  clients, the next wifi cliente that tries to connect (windows or android) get an erro message "connection" or "can't connect to this network" (message can be quite diferent as the messages are in portuguese)....

I fight a lot to identify such problem as no logs, neither any information on the tplink documentation...

have any one experienced same issue ? any clue / workarround ?, 

thank for you coments

Manuel