DHCP just stopped working !?

Hi, I have Macbook Air SSD running Leopard 10.5.2 (9C7010). Boot ROM version MBA11.00BB.B03
It would appear that in the middle of the day, DHCP just stopped working. It doesn't matter whether wireless or connecting via the USB ethernet adaptor. If I want to get network connectivity, I have to manually assign the right IP address, router address, subnet mask and DNS addresses.
While I was travelling from UK to India this weekend, DHCP just stopped working - default "Automatic" network location.
It worked at home, it worked from the BA airport lounge.
When I arrived at hotel in India, I could not connect. Network Prefs reported a locally assigned IP address. I contacted their IT dept and got static IP address, router address, DNS addresses, and then everything was fine again.
In the office in India, no joy again with DHCP and it reported locally assigned IP address. Again, when I got static IP/router/DNS from our IT helpdesk, everything was fine.
Now I returned home, and it's just the same. DHCP not working, but if I assign a static IP address on my own home 10.x.x.x subnet and manually tell it the gateway address and DNS servers, everything is fine again.
I have rebooted quite a few times. I didn't install any new software or change any settings - it seems to have simply stopped working on the plane between UK and India !
Anyone else had DHCP problems like this ? Or have any idea how to get it working again ?
Cheers
The Baron.
Message was edited by: Baron15

Just got back from the Apple Genius Bar.
They booted my MBA from a separate boot disk, and the DHCP worked fine. That proved it was a software settings fault rather than a hardware fault.
They then tried deleting all the Locations from network setup, and adding a brand new fresh one. Sadly that had no luck.
They then advised me to try an archive/install of OS X from the original media. If the archive/install doesn't work, they said to come back to the Genius Bar with the install media and they will book a longer appointment
When I got home, I first created my own boot disk on a spare USB hard drive, and confirmed that if I boot my MBA from this fresh installation, the DHCP works just fine. So I am hopeful about the archive/install.
I am trying it now. If I have any luck, I will let you know. Also how painful it is copying over previous user settings, applications and so on.
TB.

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