Originally Posted by Nick-S- View Post
the channels are set to automatic, should I configure it manually?
and where can I find this duplex?
You can use this tool to scan for Wi-Fi networks and to see on which channel they are.
Select the channel which is free or barely used.

Duplex setting is not always an available setting in your router/modem, but if it's there, set it to full duplex.
Just crawl all of the pages in your router/modem.