My iPhone 15 Promax gets dark while taking photos

I don’t understand why my iPhone 15 promax which is less than 6 months old gets dark easily while I’m using the camera. It also happens when I take video even if its just less than 5mins, it will automatically darkens and gets hot. Its annoying in every sense of the word because I can’t utilize my phone. I can’t take good photos because its going to be hard to see the picture you’re taking bcoz its dark and the phone gets so hot…

also when I edit my photos on some app, the phone will get dark in less than 10mins. I don’t understand why this phone is like this. It’s annoying, frustrating and I am now regretting that I chose this phone