Question : DNS name resolution problem, ping fails, nslookup succeeds

For the past few months I've had problems resolving host names on my Vista SP2 system.

The DHCP server and the DNS server is hosted by W2K8.
The DHCP primary DNS server points to the W2K8 DNS server.
The DHCP secondary DNS server points to OpenDNS.
The DNS forward zone is "bar.home".
The DHCP domain property is "bar.home".

The computer name is "client".
The full computer name is "client.bar.home".

When the problem happens:
"ping foo" fails
"ping foo.bar.home" fails.
"nslookup foo" succeeds.
"nslookup foo.bar.home" succeeds.

If I stop and restart the dnscache service, the problem goes away.
"sc stop dnscache"
"sc start dnscache"

After a while, the problem returns.

The NT eventlog does not show any name resolution related errors.

Any ideas what is wrong and how to fix it?

Answer : DNS name resolution problem, ping fails, nslookup succeeds

I would try configuring it with only the primary DNS server and see if it makes a difference. How much time does it take to stop working?