Macbook connectivity to internet via airport extreme is flakey

Hi,
Just bought a brand new airport extreme and I already own a June 2009 Mac book pro w/ snow leopard.
I always run software updater, so the Airport 2009-002 patch/fix is on this system.
I have a strange problem with my connectivity to the internet from my mac via the airport extreme.
Very regularly (and seemingly randomly) the laptops connectivity to the internet will drop out... i.e. websites won't respond, big websites (like google) don't respond to pings or anything. While these internet "drop outs" are happening, i can jump onto my PC (which is connected to the airport extreme via ethernet) and the internet is working fine.
Also, Wifi never drops out through this whole situation. This means that while I can't access the internet, my reception is still FULL and I can SAMBA connect to my PC and with other computers on the network.
It's very strange that purely internet via the Airport Extreme is having these issues.
The Airport is in Bridge mode (which means the ADSL modem/router is the DHCP server). The ADSL modem/router does not have wifi active or anything connected to it (other than the airport).
I've never had any issues with my internet - this is the first. My only real option if this can't get resolved is to return the airport, as this is inhibiting me from working from my laptop.
Anyone else experience similar issues?
Can someone recommend any course of action to work around this issue?
Is there anymore information this forum needs to debug this problem? How can I obtain this info?
I hope someone can help.
Regards,
Vijay

I seem to be in a very similar predicament, however I'm served even worse:
I'm loosing Internet connection over both LAN and WIFI. And the Airport Extreme does not detect the loss of connection even though the logging indicates the internal ntp client (trying to connect to time.euro.apple.com) fails (already on dns resolution).
Currently, I'm dvlp-ing a shell script that checks 4 websites, and if all 4 are unaccessible, I launch an applescript that restarts my airport extreme basestation.
This however does not always seems to solve the problem. Seemingly I would have to reset the modem.
The problem can - according to me - not be provider related, since it does not occur when the TimeMachine is replaced by a SL-installed mac mini (that however cannnot function as router (yet)).
Any hints ? anyone ?
I previously had installed an Airport Extreme 10/100 version, which showed the same behaviour. Since the system was out of warranty, I decided to upgrade to a faster system, including TimeMachine, but unfortunately, the problem is still there.
I'm guessing now it could be related to the router being configured in dhcp (getting its ip address over dhcp), but the server provides a static ip address (never changes),... and maybe here there's something fishy.

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