I have a Virgin Media Superhub 2 and connect my Airport Extreme (wired connection). My Airport Express is connected wirelessly to extend our network. The 'Apple' network is separate from the VMS2 networks.
If I make any changes on my Airport Extreme - like change Access Control setings, the Airport Express stops working and can only be used again if I do a hard reset.
I must be doing something wrong. Is there a better way to do this?