TP-Link TL-WR841N not working from few meters

Hi,

Am wondering if anyone could please help me as i have tried everything to no success.

I bought a TP-Link TL-WR841N which i have managed to setup up properly, i am able to connect to the wireless and get internet access. However the minute i walk out of the room or a few meters away i am disconnected and i can't re-connect, i get the "windows cannot connect to TP-LINK" message. The signal strength in on excellent and i know it works because when i stand near it, it works perfect.

I phoned TP-LINK technical support who were pretty useless and couldn't fix the problem. I tried changing the channels but same thing happens and i am out of ideas!!!??

Any suggestions will be much appreciated.

Thanks