iPhone 13 getting hot at bottom half, while top half of the phone stays cool

Hello!

I just got my iPhone 13 and I have only used it for a couple of hours. The phone is getting hot after minimal use. I might use it for two minutes then I get the warning that the phone needs to cool down. It is only getting hot at the bottom half of the phone, the top half stays cool.

Have anyone heard of this problem or experienced it and knows what I should do?