Xz premium becomes hot after simple use

[Koss1]

Hi guys.. Only my phone becomes hot after short time of simple use? When i pick it up and start to use it starts from 33 and after a short simple use like facebook becomes 39. After a short game (around 10 min) i get 43. Is it normal? Sry for bad english

[Koss1]

Thx a lot for your opinion

[Kunicross]

Are that values from the internal temperature sensor? 

For me the phone has stayed very cold in most situations like charging or watching videos - the only time I got a Temperatur warning was after charging it in a 32° office and then tried to do some 960 fps video directly in the sun. 

[Lord_viridis]

If it's the cpu core temp... It's not hot at all.