what causes a domain to just stop working?

I adminsiter a site - www.eccc.us that just goes off sometimes. I make no changes to its DNS records or anything. Other sites located on the same server work FINE. Other sites with the same IP address work FINE.

More weirdness that might help you help me figure this out:

SOME of the email accouts are down, but not ALL. Some return "invalid host" errors and some login and check and receive mail fine. But most don't. All email accounts are set up identically except for username.

I'm pulling my hair out.

The entries for the domain also do not show up anymore when I do nslookups...

Any ideas? Can you access the site?

 

 

 

 

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