Wireless connectivity on brand new Dell XPS One 2710

Hi,

I have recently bought a brand new Dell XPS One 2710 with windows 7.

Really annoyingly, the WIFI connection is very slow, and disconnects every 10-20 minutes (sometimes reconnects again a few minute later, sometime not until the computer is restarted).

I have no such problems when connecting with my Lenovo laptop to the same network.

The wireless card installed is: Dell Wireless 1703 802.11 b/g/n (2.4 GHz).

As far as I can tell the driver is up to date.

Would appreciate any advice on the matter,

Thanks,

B