I had a similar experience from the first day I bought the Galaxy S6. After two days I upgraded it to Marshmallow 6.0.1 and suddenly the overheating disappeared! And even the battery life got longer :) So try this if you still have Lollipop on it.
I had a similar experience from the first day I bought the Galaxy S6. After two days I upgraded it to Marshmallow 6.0.1 and suddenly the overheating disappeared! And even the battery life got longer :) So try this if you still have Lollipop on it.