Resolution:
This advisory is generated when you leave the Event Manager for more than 5 seconds i.e. this advisory gets sent when the RV main loop has not been processed in 5 seconds or more.

This is just a warning that you should monitor your callback durations.  Your application may not be processing RV events in a timely manner, and the consequences are that it may eventually lose messages.  This advisory is a hint that you may need to redesign your application to use a separate thread or process to handle the more time-consuming tasks.