sites down randomly in different countires

some (very few- like 3 or 4 of our 250) sites go down randomly for about a minute or less and then go back up, sometimes it would be down in one location and up in another at the same time.

I think it might be a DNS issue but don't know where to start.

I was thinking it may be this (tell me if I'm off base here):
I have my "hostname" set to host.localhost.com even though I don't own that domain (just to have it somewhat anonymous for our clients), I get an error email every day about the IP of localhost.com not being mine. but other than that anoying email I don't think it poses me any problem. Could that be what's causing me this problem?

Thanks for your help guys

 

 

 

 

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