This problem is caused by uneven power supply to the Tv, I suggest testing your power surge with a voltimeter and try getting a surge protector with a battery (UPS unit). if that doesn't solve, then it must be a hardware problem on your tv and you should return it.
Today's Tv's has a slot for an sd card if yours has one. Then you need to check with your Models firmware 'It might need to get updated. We have Panasonic and it was doing the exact thing we updated the firmware. And it resolve the issue at hand. Good luck.
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