8 - Spotless but spot on

In this episode, Steven Janssens takes us through his most memorable Collaboration mysteries.
In one story, Steven is faced with random Webex endpoints disconnecting with no other logs than "user disconnected session" but the user swears they didn't disconnect. Is there a ghost involved ?
The other story involves latency troubleshooting in peak hours and load measuring. The server should have plenty enough power but somehow is still not able to cope with the load ?