I am so glad i have seen this.
I am not technically minded AT ALL half the words u have written - i do not understand. However, im here because my old wifi connection was awful and i was given a new hub - which seemed to sort the problem for a few weeks. But now its awful again. At least once a day my hub stops working - and when i look on my phone at the available connections - it shows me an extra one coming from my hub, named guest! It only appears when the hub goes mental, its never there any other time.
I am literally sitting in my home, one foot away from my hub - using my phones 3g connection as i cant get on the service i pay a fortune for, to write this msg. And yes - the 'guest' connection is there. Its freaking me out now and making me more than a little furious!