Flex Box + Samsung Smart TV

I have had Flex for a couple months and it's performed perfectly with my Samsung Smart TV. However tonight, my Samsung will not recognize the Flex is connected. Then I connected my laptop to the Samsung through the HDMI cable and no problem.  I connected the Flex to an external monitor, and it shows up on the monitor.  Does anyone know if there was a recent update to the Flex that could have created a conflict?  TIA...