My is my Samsung S6 Edge + got so many problems?

[AC Question]

My S6 Edge + gets very hot as soon as I use it and sometimes I can't touch it as it's so hot. I have taken it back the store and they did a reset of my phone which would solve the problem. It worked for a few days. Also every time much camera is running, it makes the most horrifying sound; a loud crunching sound. Please could someone help me out?