No video.. only audio on Sony TV

Apr 19, 2018
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I unboxed my Sony 48 yesterday and I connected it to plug. Then I connected my hardisk in USB port given. I played 3 songs for 15min then I switched it off. Aftr half hour I switched it on and played a movie from hardisk. Now after exact 5min, the screen turned black but the sound continued. I could see the different black reflections on screen as the movie continued.
I switched it off and then on again. It did the same thing but now it shows the screen for hardly 2 to 3 min only.
I slept dissapointed.
Now today morning I switched it on and played song so initially it continued for 2 songs i.e 10min but again screen went off and now again the same problem.
Please suggest some rectification.