I was trying to think what's the difference between the live and studio environments and these issues came to mind:
- Vibrations - the high sound levels might resonate inside the body of the Virus and cause this. To test this put your setup on top of a loudspeaker and play it loud for a few hours.
- EM interference - many people in the audience with wireless devices. To test it, put your wireless router, smartphones of friends and family etc. around the setup for a few hours.