Click the 'Options' button on the toolbar or select Tools|Options... . Select the tab marked 'Silence Detector'. This will bring up the following box.
Choose 'Enable silence detection' by clicking it once with the left mouse button.
If this is enabled, the programme will take the specified course of action when the defined period of silence is detected.
It can display a message box, go on to the next song, or restart the system, whichever you choose.