May I know how long will it take to crash the 5GHz signal in average?

When the 5Ghz wireless disconnects, could you see the 5GHz signal on your wireless devices? It just disappears or still exists there but couldn't be connected? Will a reboot (not reset) fix it?

Just download and install the latest firmware version on the Canadian official website. http://www.tp-link.com/ca/download/Archer-C5400.html#Firmware

If you want to change the DNS settings only for your client devices after C7, then you can refer to DHCP -> DHCP Settings on the admin page. If you want to change the DNS settings for your whole...

I'm not sure about your problem. Archer C9 acts as the primary router or second router as an access point? If you want to set up C9 as an access point, please follow the FAQ link below:...

The signal name that starts with TP-LINK is the default wifi name of a tp-link router. Thus you need to enter the default password that printed on the label at the back of the router.