Intenet connection via wireless router drops every 10 minutes

I am running XP Home & have set up a Belkin ADSL modem with wireless router.
This has worked fine until recently when the connection keeps dropping every
10 minutes.

After much trial & error the only way I can seem to get it to connect again
is to go into the router ip address utilty & reset the DNS server settings.I
then have to 'Repair' the connection.

Any suggestions what is causing this & how to fix it?

Thanks

David

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