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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. :-/

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

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

alt text

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Great idea, unfortunately it hasn't helped. Any other ideas? – Epaga Sep 17 '09 at 18:13
use some up-to-date Linux Live CD (e.g. Ubuntu 9.04) and see if the wireless connection works flawless there (to rule out faulty hardware) – Molly7244 Sep 17 '09 at 18:24
up vote 0 down vote accepted

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.

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