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Thanks for the reply. If the set was shutting itself on off for a while before, I'm not going to give false hope- but this is a hardware failure in the set- that's why I asked for the model, in case you were looking to repair it yourself (which of course would include pulling it from the wall and removing the back of the set to replace the "Mainboard").
This is a pretty common issue with Samsung, and other makes too- and not something there's any resets or pushbutton fixes for. If you're not comfortable opening up the TV to make this repair, then a shop will charge $300 parts and labor to swap out the Mainboard. You can locate a shop at the link below:
Alternatively, if you're looking to fix the set yourself- you're going to need to pull it from the wall, and I'll need that model number. Then I can dig up a source for the Mainboard for you to purchase.
Other than that, I'm sorry for the bad news and wish there were a quick fix.
If you need further assistance let me know. Please do not forget to click a POSITIVE RATING before you go- as it's how I am credited for my work. You can follow up at any time, at no additional cost.