Unplug all HDMI cables, power off, remove power for about 10 minutes. Apply power, one HDMI cable and retest. If that fails then it needs service.
I have Samsung 40" LED 3D Smart TV, after 2 years of using the screen flashed for first time, i though it could be online streaming issue. Slowly the issue started to become worse that in every 10, 15 or 20 min the screen goes Blank then comes back. Sometimes it used to stay Blank for longer time also my Android Note 3 had issues in Screen Mirroring too.

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