Satellite P745-S4217: No WLan connection if 10-12 feet away from router

Hi everyone!
I have a problem with my wify conecction.
When Im near the router, the wifi conecction works perfect, I get a full wifi indicator on windows and I have no trouble surfing the web.
But when I move 10 or 12 feet away from the router, althoug the wifi indicator gets three or four coverage stripes, my laptop can't make the conection.
It's too weird, because my ipod works perfect and other laptops too.
Hope I explained properly.
I tried the latest driver but that doesnt solve the problem, I change some power settings but that doesnt solve it either.
Can anyone help me?
Thanks in advance...

Thanks for the answers.
1) I changed the power settings in order to have high performance for both cases. With the battery power supply and with the AC power connected.
2) Im sure I have the latest update for my wlan driver.
Is pretty weird because (when Im away from the router) the connection works good for a while and then fails for a few minutes, after that, works just fine again.
Maybe I have to change the wlan settings, I dont know. A friend told me that probably my wlan card is not well connected, what do you think? Should I open my laptop and check?
Hope you can help me, thanks in advance...

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