@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.

@88424439 Hello, if you want to change the wireless password of the TP-Link wireless router, please check the below guide: https://www.tp-link.com/support/faq/399/ While if you forgot the login...

@Calvin_K To locate this issue and try to fix it, we would like to follow up on your case via email. Please check your inbox and provide the information that we need.

@RussieLab The Archer C20 is equipped with 5 10/100 Mbps, 1× 10/100 Mbps WAN Port and 4× 10/100 Mbps LAN Ports, that is going to be a bottleneck for you, you cannot change that from the router web...