Prehistory (might be helpful): Everything was fine before Eowyn Storm. I live in a flat and I always had even the public EE wifi signal with my hub wifi signal. Just a day before the storm I arrived at home and noticed that there is no WiFi signal at all, the hub shows green color, then blinking white one for second, again green and turn off for 2 seconds and goes again this circle. The public EE WiFi disappeared as well. I have connected with EE guide next day (storm day) and after 2 hours of all possible troubleshooting actions we have finished on booking an engineer visit.
What I had for next day and what I have now:
When I turn off the hub from power for 3+ minutes and turn on back - it works (Aqua color, Opensearch modem shows light on LAN). But then the wifi signal goes disappeared, green color goes for 30+ seconds, then blinking green and so on, Opensearch modem shows no light on LAN. Power cut restart helps to get everything back, but again - just for a while.
Is it anything can be possible to do to fix that, update firmware or something, because I believe that engineer might come next week and would say to reorder a new hub.
The public EE wifi works fine, but it cut me off every 30+ minutes and I have to re-connect again (I think there is the limit of the session, would be great to know how to stay longer).
P.S. Factory reset button doesn't work, I could hold the button for 1 minute and there is no change of colour, when I go http://192.168.1.254/, and trying to factory reset - wifi signal just disappeared again and shows green colour.
