I've extended my wireless network to cover some weak areas in our house. The original wifi router is in my upstairs office, but gave poor coverage in some downstairs rooms, so I set up an "extended service set" wireless network with two access points, the original router upstairs and a Solwise homeplug WiFi extender extender downstairs (with a powerline link between the wireless router and the Solwise wifi extender), each using a different channel but the same WPA password.

Every other wireless device in the house works happily between the two, but my Desire only seems to want to log on to the main router and defaults to mobile internet access in the 'difficult' areas. It seems to repeatedly try to get an address from the network downstairs, but reports 'unsuccessful' and keeps retrying.

Any suggestions?