MBP Airport consistently disconnecting from the Web, but not the network

My MacBook Pro Airport has been cutting in and out - or at least the Web access has - when I use it in combination with a DLink router. The local wireless network connection always seems to stay connected (or at least it says it's connected), but I can't access the Web. It has shown these symptoms when used in combination with other routers too, but only when I use it with the DLink first and then move to another network.
I can sometimes fix the problem by a combination of restarting OS X and resetting the PRAM, and restarting the router. However, this doesn't always fix the problem, and even if it did, I'd probably be doing it at least once a day with the current frequency of disconnections. So I'd like to get to the route of the problem.
An ethernet connection to the DLink router always works without a hitch.
Does anyone have any suggestions or any knowledge that might help resolve this?

Just remembered I have the 'self assigned IP' error too. There seems to be a fair few posts about this issue. I haven't found a definitive fix yet, but these posts might hold some clues;
http://discussions.apple.com/thread.jspa?messageID=6710925&#6710925
http://discussions.apple.com/thread.jspa?messageID=6708778&#6708778
The second post suggests applying the 'Disconnect from wireless network when logging out', which I've applied, because I've noticed that I often see the problem when I put my MBP to sleep.
p.s. Last year I quick-fixed this issue by attaching a Buffalo wireless router to the network as an extension and connecting to that instead of the Dlink. But I just gave the Buffalo to someone, having forgotten about the issues with connecting to the DLink.

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