I have the same problem. To improve WiFi on the top floor (plug-in extender is not good enough) I just bought an ASUS mesh system. When I tried to set it up I found that it set me up with a new WiFi network but it had disconnected me from the internet. On the ASUS system App I was allegedly connected to the Internet but my iPhone and laptop told me that I wasn’t. I had followed the advice of some gurus saying the WiFi had to be turned off in Advanced Settings on my Plusnet hub, as the Plusnet One hub cannot be set as modem only. That threw me, because I was without internet almost all day until a very nice Plusnet rep reconnected me and helped me reset my hub. I learned that I had not reset my hub properly, as I had only used the reset button but not pressed a pin into the little hole at the back for at least 20 seconds! I also learned that it was better to split the wireless into 2.4 and 5 GHz rather than leaving them combined.
The next step will be to try out the following:
Go to Plusnet router homepage, normally 192.168.1.254 then into advanced settings, wireless and turn off the 5GHz wireless. I will leave the 2.4 GHz on this time to see if I can keep my internet connection. I have a suspicion though that both need to be turned off.
The WAN cable from the blue port of one of the ASUS mesh devices then goes in to one of the yellow LAN ports on the back of the Plusnet hub. For this, the ASUS mesh device needs to be set up in Access mode, not in router mode.
Fingers crossed it will work. If it doesn’t I return the ASUS product and get the Netgear Nighthawk instead (a lot cheaper).
