The FLIR Night Vision camera system developed a problem.  When the system is powered up, the initial screen  (system information, etc.) displays for about 10 seconds and then the screen (Raymarine E80) goes blank with just the word Flir in dim grey letters  displayed at the top right of the screen.  When left on for over 30 minutes, the display shows what the Flir camera is pointed at.  The system continues to work without any problem until powered down.  If the system is immediately turned back on, it works and displays correctly.  If the system is left in the off position for 5 or more minutes, it displays a blank screen when powered up again.  Referred the problem to Gary at Alcom Marine Electronics.