I haven't seen the problem again since, hence the reason I haven't engaged Samsung Support (I doubt if the set retains an event log); however, my set did switch itself off on one occasion last week for no apparent reason. I was hoping ACracknell was going to update us once he (she) had received a response from Samsung on this problem. Failing that, I'll contact Samsung if it re-occurs on my set and update peeps here with the outcome.
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