Reasons for random switch to “limited connectivity” under Vista?

Question

What are the various reasons for a single laptop computer to repeatedly randomly switch to "limited connectivity" on a previously working wireless network - sometimes after a couple of minutes, sometimes after an hour or longer? Here are various other facts of interest:

• Computer is running Vista Home
• Other (laptop and desktop) computers work fine in the wireless network without losing their connections.
• The network adapter is Intel PRO/Wireless 3945ABG Network Connection
• After losing the connection, the only way to reconnect is to either reboot the computer or deactivate and reactivate the network adapter.
• The connection is lost when the computer hits a high CPU load, for example when running Flight Simulator X.
• Signal quality is great, even with limited connectivity (5 out of 5 bars)
• Power Saving Mode is on "Loud Environment" mode, i.e. the highest power setting.

Let me know if I'm missing any important information.

Edit 1 - see this thread for some ideas. None of them work for me however. :-/ http://www.vistaforums.com/forum/Topic4198-45-14.aspx

Edit 2 - for anyone else visiting this, you could try the latest Intel driver (June '09): http://is.gd/3o0wh This seems to have worked for me! (fingers crossed)

Answer 1

Change the Power Saving Mode of your WLAN adapter to 'Disabled' or CAM (Constantly Awake Mode).

Answer 2

Use the new (June '09!) Intel 3945ABG driver. That seems to have worked for me - at least, the steps I used to reliably reproduce the problem (start up Flight Simulator X, fly around a minute) now no longer reproduce the problem, I haven't had the connection drop off since.