Let Samsung fix it. If you are in the USA, head to samsung.com to register the unit to extend the warranty by 3 months.
I have bought Samsung Series 8 top model of the line last december 2011 model UA60D8000 (silver chrome finish).
Today, it just behaved weirdly during my son plays PS3 on it. it automatically switch off and on repetitively every 2 secs. Once the SmartTV logo appears, it switches off again and on back again repetitively.
I tried to reset by switching off the power from the remote but didnt work. Then, pulling out all the cables including the power cable (which was connected to the UPS 3Kva). It still didnt work after i put back the power cable.