@paparazz01 I see. May I know how many devices need to be connected to the network in total? Are all of them experiencing the same issue when connected to the WR841HP? Have you tried to modify the...

@Terserah I see, may I know how did you recover the connection? Do you need to reboot the WR820N manually by powering it off then on? When did you purchase it? Can you show us the current firmware...

@Oakmario Hi Andre, thanks for getting back with all the detailed info. Is it possible that this unknown devices with the special MAC address is a virtual MAC of one device in the network? I just...

@AsifShaafi Hello, may I know what is the region version of your TP-Link router, please? If it is the EU version, as we always stated that it only supports band 1 for the 5GHz, which is designed to...

@Any1else You may need to login to the router web GUI, then you should be able to see the connected devices either under the DHCP client list or under ARP list (Advanced->Security->IP & MAC Binding).

@Andrew_06 Have you tried the previous suggestions provided by Sunshine? If that doesn't help, it is suggested to reset the router to factory defaults, then reconfigure it from scratch to confirm,...