Windows loses DNS capability periodically - reboot fixes

Can anyone point me to a solution to this problem which has only been
occuring for about a couple of weeks:

After XP has been running for a time (say 24 hours) it loses the capability
to resolve internet addresses.. IE/Firefox just say "looking up xxx.." OE
can't reach the mail server. There's nothing physically amiss - I can still
access the internet via IP addresses.

I have only the one pc connected to the router; restarting the router
doesn't have any effect - and my browser can't even resolve the router
address "http://speedtouch.lan"; at such times - but restarting Windows always
fixes things at once... until the next time..

I don't know where to start looking in the case of such an intermittent
problem. Any advice would be gratefully received.

Walter
.

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