Are you running any third-party plugins and/or profiles? If so, does this issue occur with plugin support disabled?
When the issue occurs, does the listening state remain enabled (I.E. no red icon over the headset icon on the main window), or are commands executing without the listening state changing?
The speech recognition engine keeps listening in the background to enable commands that override the listening state to be recognized; E.G. commands using the "Make VoiceAttack Start Listening" as their first action, or any command executed using an "Override listening if my spoken command begins with" prefix.