@John_Titor Who is your ISP, and what is the WAN connection type on the C20? Is there still a WAN IP address, default gateway, and DNS servers when the internet LED changes to be red? When you click...

@Jools72 What's the device that connects to port 2? Does it use a static IP address? Try to change it to obtain an IP address automatically from the router, then confirm. BTW, how about the LEDs...

@suththicit8 Hello, please check the PM, then confirm if the issue is resolved, thanks.

@jhasp-pune Glad to hear that you got the issue resolved by changing the MTU from 1500 to 1400. The firmware you can see on the official website would be the latest we can provide.

@bilbil Is your Archer C6(EU) 2.0? What is the current firmware? Have you tried to review and verify if there is interference with the signal? Try to run Wi-Fi analyzer to verify and find a clear...

@Subho440 You are suggested to update to the latest official firmware from the local official website: https://www.tp-link.com/support/download/archer-c6/v2/#Firmware If there is still an issue,...