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On laptop or notebook computers that use Intel PRO Wireless 3945ABG built-in Wi-Fi network adapter in Windows Vista, the WiFi radio signal may just suddenly turns off, shuts off or disable randomly, with the Internet or network cuts off. The wireless network connection may still appear as active and connected with Excellent signal strength in Network Center, but the network status will change to Limited Connectivity. If the system has LED indicator for Wi-Fi wireless radio signal status, the LED light also turns off (may also stays on) and Wi-Fi radio power cannot be toggled back on with Function hotkey (such as Dell QuickSet), even though the software detects the toggling or pressing of keys with WiFi and Bluetooth logo pop up. It looks like the Wireless adapter card loses its power and are completely shutdown and powered off.
Even when the problem happens, the network device appears working properly and normal in Device Manager. The IP address auto-discovered by DHCP may be lost or gone. And there is no way to recover the Wireless radio signal other than restart the system. But the problem will happen again. Even changing configuration settings of roaming aggressiveness, transmit power, wireless mode (between 892.11a/b/g) or power-saving mode does not permanently resolve the Wireless network adapter off problem.
Geo
Even when the problem happens, the network device appears working properly and normal in Device Manager. The IP address auto-discovered by DHCP may be lost or gone. And there is no way to recover the Wireless radio signal other than restart the system. But the problem will happen again. Even changing configuration settings of roaming aggressiveness, transmit power, wireless mode (between 892.11a/b/g) or power-saving mode does not permanently resolve the Wireless network adapter off problem.
Geo
