Hi friends last night I watched chandrayan 2 landing mission from 12 to 2: 30 in note 9. While watching videos in YouTube there is no heat production and very quick battery decreases..I feel happy to owned note9
Actually if you render and stream hd videos it takes a good portion of battery usage and the phone will surely heat up a bit. This is normal. Glad that you are happy with your note 9. Its stable and a very good phone so far.