NSlookup times out

When I do a NSLOOKUP the primary DNS server returns it’s name and IP
addy right away. Then at the prompt right below my first command, I type
NSLOOKUP and any server name and I get the server name and IP addy returned correctly as well as a pause and the following text :

> DNS request timed out.
> timeout was 2 seconds
> *** Request to servername timed out
>
> > Any ideas as to what is wrong ?