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I recently purchased a Samsung 43 inch Smart TV model no.UE43NU7400 from Amazon. At first it worked ok, then the picture suddenly went off. The tv then wouldn't turn on for several hours before suddenly coming on again. I t worked ok for a few hours before going off again, then came on again hours later, only to turn off again in a few hours.Etc. At the moment it won't come on at all, it just keeps flashing the Samsung Smart TV logo up every few seconds. After looking online and on this forum, it seems other people have a similar problem with Samsung TVs and I have followed all the advice given to them - I've been into Settings and turned off Anynet, Eco Protection and Sleep Timer.It seemed like these ' fixes ' worked at first, only for the tv to turn off again within a few hours. Does anyone have any clue how to fix this?