No its not it just turn off because of non interaction.. It just goes poof off.. Can be hours into watching, or just a few minutes.. Sometimes seen it happen a few times in a row..
If you look up the tv brand - you see quite a few people complaining about.. But wonder if it is power related. Not going to hurt to have a ups on it ;)
When it shuts down for normal reason you see icon in top right showing power down.. When this happens its just "poof" off.. Like you pulled the plug or something.