@Reflection Maybe this article will help you with the issue.

@Randomz If TG789 is bridged then you should use AX20 in wireless router mode - same connection as for the AP (TG789 LAN port=>AX20 WAN port). Then AX20 will be your main router. You can do a...

@nyonyo Because of the nature of wi-fi media - it is a half duplex technology. More details -...

@Randomz You can set AX20 in AP mode (Case 1) with a LAN IP address within the TG-789 LAN range. For example if TG-789 LAN IP address is in 192.168.1.0/24 then for AX20 (in AP mode) LAN IP address...

@Fahl Contact the support @support@tp-link.com. Make sure to provide the device FW, HW version and the description of the problem like you did here.

@AstroGD Have you tried to restart the device and see if that makes any difference ? You can even backup the configuration and hard reset the device (method 1) then restore the configuration to see...