@JonEx Hi Jon, as per your description, it seems the wireless devices are still connected to the wireless network of the C80 whilst some web pages cannot be opened, how about the signal strength at...

@Baanda Refer to this guide to use the WPS function of the router: https://www.tp-link.com/support/faq/2656/

@Jdhn The Archer C60 supports QoS by device, you can follow the guide below to configure it: https://www.tp-link.com/support/faq/2797/ (Case 2)

@EmptyStreet Is it possible to take a video of the reboot issue when it is working as the main router? What kind of modem does it connect to? What's the model of it?

@wagego Does this issue only happen on wireless devices? Please check if the devices that connect to the router via an Ethernet cable will work flawlessly when there is no internet on the wireless...

@Alam1983 Go through this setup video to configure the router. If your modem is a cable modem, you can check this video. If it is a DSL modem, check this one.