After locking Portege Z930-E7S loses Wi-Fi connection

Our company purchased 3 this laptops for the top managers. All of them has the same problem with WiFi connection. When laptop is locked by Ctr-Alt-Del , then it loses conection to Wi-Fi.
To reconnect it , it is necesary to reboot the laptop. In other cases laptop does not see WiFi point.
Is it possible to fix it or this a model problem at all?

Hi
Did you already try to update the WLan driver?
Im not quite sure but I think the notebook was equipped with the Intel Centrino Wireless-N 2230 WLan driver.
So you could also try the latest WLan driver released on the Intel page.
Your feedback would be greatly appreciated.

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