Such and Such site has gone down at xx:xx

I’ve been getting emails on a daily basis, often several times per day from Virtualmin telling me that has gone down at xx:xx

It basically sends me one for each domain that is monitored, and I can’t figure out why it’s doing this as the sites are working fine everytime that I go to them.

I finally got fed up with it and turned off the monitoring of individual domain names on our server but would really like to know what could be causing this message to occur so that I can turn back on monitoring and get real messages when sites are down.

I suppose it could be a really brief outage that only lasts a couple seconds but Im baffled as to what would cause it or how to find out what causes it.