My Samsung TV just recently started turning itself off and on. I've unplugged the TV overnight; disconnected all devices; changed out the batteries in the remote and reset the remote; changed electrical outlets it was plugged into and nothing has resolved the issue. It doesn't stay on long enough for me to take any of the other steps recommended in reviewing Samsung info. I do have a technician coming on Thursday but I would like to know if there is something else I can do in the meantime.
I would recommend trying to update the software if it stays on long enough to try. Other than that all troubleshooting steps have been completed, waiting for the repair will be the next step.