Service monitor false positives?

I have a new site online for a customer, but at least twice a day the service monitor says it's going offline, even set to a 20 second checking timeout instead of the default 10 seconds...the thing is, it is always online everytime I check, even only minutes after the report, and it's a dedicated server, and not too many users on it yet. The site in question loads very fast too from the index page to logged in and playing (php mysql based game site).

All other older domains hosted on the server are not sending any alerts. I think it's a false positive, but I have alerts enabled as a feature for customers too, so I'm worried about too many false positives scaring them away.

Any guess as to whether this is a bug, or only happening to my server?

Status: 
Closed (fixed)