Mostly it happens on our episodes of our radio serials (but not consistently). But we weren't having this problem before the most recent version upgrade. It all started about then. No other changes.
Either the information being sent to the Shoutcast DNAS Admin panel is being curtailed, blocked or modified, or something about the Shoutcast DNAS itself is being periodically broken. Since the Centova software is what changed, my money's on the Centova software.
A complete shutdown and restart of the stream and AutoDj usually (but not always) clears the condition. For about an hour after the restart there is no recent tracks data available at all - then it begins to behave normally again. It almost seems like it has to fill the recently played list buffer before it will start displaying anything.