Global Monitor Web App monitor intermittent at times

We have a global service monitor setup to monitor our web sites externally.  They work pretty good for the most part.  It certainly gives us some good feed back.

Occasionally we do see intermittent results and wondering if anybody else has seen this.  The error says something about DNS resolution failed as seen below.

Does this meant at the site of this particular monitor it could not resolve the DNS entry for the monitor or would it indicate that it could not find the site it was trying to monitor.

I think the first but I am not sure.

Any ideas on how to remove the intermittent nature of this alert?  I know we could set the alert to happen on the second consecutive but that forces us into a 10 minute window (instead of default 5) where a site could be down and we dont know.

Thanks Lance