Satellite L650 Wireless disconnects and connection can't be recovered

Hello everybody,
I have a connectivity problem with my 3 years old Satellite L650, Windows 7...
I have a wireless LAN in my house, to which my laptop automatically connects at startup, with no problems.
Some time afterwards (it may be minutes or hours) it loses the signal and disconnects.
This isn't a real problem, since the router is quite far away, with walls in between that may reduce the signal, so no surprises.
But I cannot reconnect afterwards: the connection status tray icon stops working.
I mean that it shows the image corresponding to "available wifi connections" or to "connected but without internet access", but neither clicking the icon or moving the mouse cursor over it gives any result... it is responseless, and I cannot connect to my wifi or any other wireless network.
I tried doing it from the control panel - network and sharing center, but the story is the same, both "setup a new connection or network" and "connect to a network" doesn't react when clicked.
The only way to connect is restart the pc.
How can I resolve this?
Any suggestion is appreciated,
thank you!

>The only way to connect is restart the pc.
In case this issue would repeat again, try to refresh and renew the IP address.
Go to console (in search type CMD)
Now use the command: ipconfig /renew
After that try to connect to the Wlan again.
In case this would not be helpful, I would recommend changing the router settings.
I mean you should reset the router. Then you should test the Wlan connectivity with different kind of Wlan protection and different Wlan standard (802.11 B G or N)
Test also the notebook with open Wlan. I mean you should disable the encryption in the router settings. But do that just only for testing purposes.
The Wlan should be always secured.

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