Airport Extreme keep disappearing from airport utility

Hello,
I have purchased recently an Airport Extreme and set it up as such:
- wired connection to my ADSL modem
- connected a 1TB drive by USB to the airport extreme
On top of this, I have an airport express that I use exclusively for itunes streaming to my stereo
Devices connecting to the Airport extreme are:
- one Windows XP PC (wired)
- iPhone, Ipad, Macbook Pro, all wireless
All firmware and airport utility versions are up to date.
First it works. All is connected, green lights, extreme and express detected by utility, USB drive visible everywhere. Then after a few hours, the following happens:
- extreme and express are not visible by utility on mac book pro (but still detected by utility on iPhone!)
- cannot stream music to express
- USB drive no longer visible from my Macbook pro
- shared itunes library no longer available
- green lights still on
- internet still on
The only way to fix it is to reboot the extreme.
Any ideas ?

I'm sorry to say that I've had this exact same problem.  It's very frustrating because I lose the ability to stream to appletv and also to use wireless printing... the two main reasons I bought an Airport Extreme and got rid of my old router.
I will continue to have connectivity to the WAN but the airport utility on my MBP can't see any available airport devices. I thought it might be an issue with my OS, so I upgraded to Lion, but no change...
I've spent time searching the forums without success. I've also posted it to twitter. Hopefully, someone can help us? I'm wondering if the router hardware is bad or if it's a wireless driver issue with my MBP.

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