I have a site running SBS 2008. Clients complain that the Internet keeps dropping. The problem is DNS is not responding. In the system event log on all client computers there is:
Event ID 1014 Source DNS Clients Event "Name resolution for the name Server.Domain.net timed out after none of the configured DNS servers responded."
This does not appear to happen to all clients at the same time but it is hard to say for sure since they are not all browsing at the same time. It does happen 2 - 5 times a day on most computers.
Since it is on all computers it is unlikely that it is a client issue. I have tried disabling IP6 on clients and server. There is nothing in the server logs regarding DNS issues.