MS DNS Server and corrupt cache records

Hi,

I have been having a reoccuring issue where my Windows DNS Server

suddenly stops resolving high profile major websites (news.bbc.co.uk

as an example), and the only way to get it to resolve these domains

again is to clear the cache. This happens every few days.

Is this a known issue, or is there something that I am supposed to be

doing? Is there a long term solution?

Regards

Richard