Basically, IIS 7.5 seems to just stop listening. No web traffic is sent or received for any hosted websites, CPU utilisation drops down to next to nothing. Then all of a sudden it jumps back into life as if nothing was wrong. The issue can occur for 5 to 10 minutes at a time.
No errors are reported in the event logs and the website logs contain gaps for the time of the outage as nothing at all gets written to them.
The server is a 2008 R2 VPS. 8GB RAM, two processors and heaps of disk space.
Can anyone suggest ways to troubleshoot this or has anyone ever encountered something like this?