HD TV flat screen. I purchased a Sanyo TV model DP26648 for the upstairs bedroom 10 days ago. My

Question

I purchased a Sanyo TV model DP26648 for the upstairs bedroom 10 days ago. My niece, age 12, has been watching it yesterday & today. The TV has started turning itself off yesterday and has done it more today. I checked with the satellite company. They found nothing wrong with their satellite. They said check the electrical wall outlet and the TV. I checked the wall outlet. It's good. It's not the surge protector. TV goes off whether connected thru the surge protector or directly to the wall. Do you have any ideas?