iPhone 4 : Can't browse on wireless network all of a sudden?

[Draeger]

My iPhone 4 has been quite happily connecting to my home wireless network since I got it a few weeks ago. I use Atomic Web Browser. However, since yesterday, the phone will find the wireless network fine and connect, showing it is connected to a wireless network but if I open up Atomic Web Browser ( or Safari ) it just sits and does nothing, the progress bar sitting with a tiny portion filled. Eventually it tells me "Could not complete request - Request timed out".

Any ideas?. I haven't changed anything in the settings on either the phone or the router ( O2 Wireless Box II ) and my laptop and another PC I have downstairs can connect to the wireless network with no issues.

 

[Draeger]

Strange - I just went into the settings on the phone for the wireless network and noticed a "Renew Lease" button. No idea what it did but I selected it and now the web pages are back to loading in perfectly at super fast speed. What does "Renew Lease" do?.

 

[Draeger]

Ah right, thanks. Why do you need to do that then?. Can't recall ever having to do anything like that with my old 2G?.