Hi grossag,
Let me help you with this.
Checking the information you have provided, I see that you are using the Airport router so I was wondering; can you try a different router for this connection? We have received feedback from customers reporting dropping connection issues with this device.
You can also contact support at the following links for them check on this:
E- Mail support for North America: http://www.intel.com/support/mailform/networking/wireless/emailsupport.htm
E- Mail support for the rest of the world: http://www.intel.com/support/mailform/networking/wireless/email_support.htm