I have at least 12 devices attached to my network at any give moment, but I seem to be having constant issues with wifi where devices are connected to the router via wifi (even in the room), but suddenly have no internet connection. Wired devices connected to the router at that same moment, do not drop their internet connection. The reason I suspect IP issues is simply because I have seen failed to obtain ip address errors from my android device sometimes. If I restart the router or the device that always resolves the issue (presumably because a new ip is assigned). I have tried the following configuration all with the same issue:
plusnet hub one router alone
plusnet hub one with wifi off + ASUS RT-N66U acting as router (I suspect that had some NAT translation issues)
plusnet hub one with wifi off + ASUS RT-N66U acting as Access Point
It just occurred to me that I haven't tried
plusnet hub one with wifi off AND DHCP off + ASUS RT-N66U acting as router which might potentially solve it, if plusnet hub one is indeed the thing that's struggling.
I'm sorry to see you're experiencing connection problems. I think the IP issue you've described may just be a symptom as opposed to a cause. Can you try changing the wireless channel in the router settings, the guide Here should be able to assist with that if you're unsure how to do it. I'd also recommend trying the steps Here.
Let us know how it goes.
If this post resolved your issue please click the 'This fixed my problem' button