Intel NUC problem?

Hi all,

Strange problem. System specs below. I have a TV connected via HDMI or DP.

Initially the display was rock solid. The problem is now the screen randomly stops displaying Windows desktop and shows a message about No Signal. The problem occurs using either video port, mini-HDMI or DP. To me this means the vid chip stopped putting out a signal.

The application running is Blue Iris network camera display. The app is running full screen.

Intel NUC i5-4250U
16 gb ram
Silicon Power SSD
Samsung EVO mSATA SSD
Win 7 Pro 64 bit
Intel HD Graphics 5000 mini HDMI and mini DP
Insignia 40" TV

Please help

Thank you

I did not find the right solution from the internet
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JoeClark