Slow loading sites

Hi

Not sure if this is virtualmin related or not. All servers are working fine and everything is fully up to date. Today, some of my sites are very slow loading and some do not come at all.

I have pinged the IP address and each site using the windows cmd line and all works fine - no packet loss.

But, this is the odd part....

www.tardisnetwork.com loads very fast www.tardisnetwork.com/badwolf takes a long time or doesn't show

Yesterday www.medusacascade.com was fast loading Today it is slow or doesn't show

Thanks in advance

John