nslookup issue

[Fabiola Caceres]

Hi,
I had this error before and it went away on its own, but I have not
been able to find the cause.
Here is the example:
nslookup www.domina.com
resolves just fine only on my name servers which are primary for the
domain, and some others servers outside, but other servers do not resolve.
I get the error: Non-existent host/domain
No one has change anything on the zone file for the domain.
This error just started happening last week for this particular domain.
I can't find any errors in the logs either.

can someone please help.
TIA
Fabiola