Want to give this a try?
- Find your wireless internet connection in the system tray (beside the clock). Double-click on it.
- Your "Wireless Network Connection Status" dialog will appear. Click the "Properties" button.
- At the top of the "Wireless Network Connection Properties" on the "General" tab, you'll see "Connect using:" and the name of your wireless adapter. Click the "Configure..." button to the right of that text box. The "Wireless Network Connection Properties" will close and your device configuration for the network card will open.
- On the configuration dialog for your network card, go to the last tab called "Power Management". UNCLICK all checkboxes, especially "Allow the computer to turn off this device to save power".
- Click "OK" to confirm your settings change.
It might not be the root cause, but it's a good place to start. HTH