Satellite C660-115 WLan connection only works when power cable is connected

Hello,
I bought a satelite C660-115 a few weeks ago. I would like to surf the internet anywhere in my home without any wires/cables.
From the first day I had this problem: when I disconnect the _power_ cable, the wireless connection will stop working.
The webpage on my screen will still be there, but loading a new page is a problem.
Sometimes it helps to reload (pressing F5), sometimes not. It always helps to "repair the ip-adress", but not for long.
The only solution is to atach the power cable, regardless of how much power the battery still has.
When I do so,there is no problem whith the connection at all.
I went back to the shop where I bought it, they connected to their own wireless network and they had the same problem after a few minutes. In the shop too attaching the power cable solved the problem.
So the problem must be in my lap top, not in my network (modem or so).
Does this all sound familliar and if so, how can I fix it?
I hope my English is understandable, I live in Holland.
Thanx in advance!

Here the solution:
http://forums.computers.toshiba-europe.com/forums/thread.jspa?threadID=59177
Change the Power Save options for Wlan in Win 7 power managment

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Satellite C660-115 WLan connection only works when power cable is connected

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