Raduga stopping by it's self

We use Raduga for a 24 hour Christian Radio Station. For some reason the system stops like it knows when someone takes a break out of the air studio.
Today it stopped and displayed an error message. Our second computer we record announcements on also displayed an error message. Both computers are connected to the internet to keep the clocks accurate.
Since this has happened close to 10 times. Is there any way to tell if anyone is hacking into our system?
Thanks!