User already logged in (when not) on hub

2 days ago none of my devices could connect to the internet and after much troubleshooting the only step left was to factory reset my SuperHub 3. I wanted to avoid this as I had a lot of ports forwarded and didn't want the hassle of having to set everything back up.

The factory reset worked in that my home network can now connect to the internet, but when I log into the SuperHub I'm lucky if the session lasts for more than 30 seconds before I'm booted to the login page, at which point I get "Remote user has already logged in, please wait..." when I try to log back in, and that's if I don't do anything after logging in. If I try to open any other part of the interface I'm kicked out immediately. I have never seen this message before factory resetting the SuperHub so I guess whatever bug in the firmware causes this was somehow activated by this.

I finally caved and bought a 3rd party router (which frankly is ridiculous. An ISP should be able to provide hardware to access the internet that's fit for purpose) with the intent to switch the Superhub to modem mode, but I can't even get to that page to tick a radio button and click save.

I've factory reset the hub twice again in the vain hope it'll stay logged in for long enough for me to enable modem mode and I can't face doing it again; that was madness lies.

Is there any other advice out there other than "restart/reset the SuperHub and the problem goes away", because that's not working for me. I host an OwnCloud server and a couple game servers for friends and family which is currently inaccessible because of the inability for this crap hardware to function adequately.

--EDIT--

Within the logs of 'check status' I noticed that ~20 seconds after a successful LAN login there was a successful REMOTE login, which I guess was kicking me off and preventing me from logging back in. I turned the SuperHub off, disconnected the cable, turned it back on and managed to log in and enable modem mode without being booted again. Fingers crossed I never have to interact with the Superhub again. I hope this helps the next person to come to this post in a few months time when the issue is still not patched.