I have a AEBS as my main wireless router (dual-band 2.4 GHz and 5GHz active) and also an airport express set to extend network and in bridge mode. The express is connected to the 5GHz network. Trouble is, the airport express sometimes seems to lose the connection to the internet (not the wireless itself) but the 2.4GHz network is always ok. As the express is only extending the 5GHz network, there is obviously some issue with it and not the AEBS! I was wondering if it something to do with DHCP? Do I need to reserve a specific IP for the express? Is my AEBS renewing the lease for the express and thus affecting internet access?? This is just a guess but I cannot figure out what is going on. Are there any other subtle setup options that I have missed?