@dron601 Is 128mbps the speed tested by connecting a computer to the VR600 Wi-Fi network? Please check what is the link speed on the computer when connected to the 5G network:...

@RageSpawn Hi, you should refer to this one: https://community.tp-link.com/en/home/forum/topic/81462?page=1 As for the original firmware, you may get it via this link.

@John-boy Hi John, thank you very much again for your detailed reply. There is an Address Release Time setting on the VR400 (Advanced->Network->LAN settings), you may check what is the current value,...

@smni Generally, the Transmit Power determines the range or coverage that the router can cover, but that will not make a big difference when it is on High or Middle, you may change it to Middle, then...

@smni Thank you for getting back. Have you tried to set the Wi-Fi Transmit Power to middle or low (if the setting is currently set to high), and see if this helps with the issue? BTW, to locate this...

@BRTK. Thank you very much for all the details. We have reported the issue to the support engineers, they will likely reach out to you via email to continue to troubleshoot your issue.