@lkyhk Can you post that screenshot : Try connecting the modem and the router with a different cable (Cat 5e/Cat 6). Observe if any difference. If the issue persists try setting Internet negotiation...

You have to observe your old router Internet port settings and make the same for the C6 internet port. When you plug the cable directly to your computer do you have internet connection ? If you do,...

Hard rest (method 1) the device, then login via the Web GUI. Change the password and try to login again via Web GUI. If the problem persists then update the FW (even with the same version) and after...

What's your Internet port configuration - PPPoE or Dynamic IP ?

@Dragos1 You can try tweaking these settings to see if any improvement: The Default MTU size: 1480 The Default Online interval: 10s

It shouldn't be like that. What's your connection speed when connected to 5GHz band (from wireless adapter properties) ?