The router ensures the network connection by detecting the first and second domain. The high frequrency can reflect network status in real-time. FYI

is there a wifi button on the router? check whether it's enabled. if we want to reset the router, we'd press the reset button for 15s to hard reset it. How about if you connect one PC to the router,...

oh, long story~ How do you test the speed? Deco APP? or PC which is wired to Deco? or smart phone which is connecting wirelessly? If the speed of Deco is slow, connect PC to Deco and PC to your modem...

yes, we can still keep our original wireless router to work with Deco M5 and set custom DNS for Deco M5.

Do they obtain ip address automatically and DHCP server auto? Do you mean the time is later or earlier few minutes than the correct one or something else?

in your case, login to APP, Settings -> Advanced -> IPv4 -> Internet Connection Type -> switch off Obtain DNS Automatically try to set DNS 8.8.8.8 under WAN. hope it will work for you. PS: make sure...