Cracked Back iPhone XR and Radiations

Hi all, yesterday I found a crack at the back of my 9month old iPhone XR - the crack is on the top left, opposed to where the camera is.

I never dropped the phone so I have no idea how it cracked, it was charging one night and the following day it was cracked.

I was annoyed enough by the situation when I eventually discovered that now it produces radiations like never before.

I am learning to play an electric keyboard, and I used to put my phone on it to follow the training app, always with no problems. However, yesterday when I placed my iPhone on it the noise was unbearable - you know when the old phones used to make noise when placed next to speakers? There you go. That’s what I have now.

Just for a test I placed my husband’s phone (iPhone XR too) on the keyboard and there is no noise whatsoever so this makes me think that there are some radiations coming out of the crack.

Please can you let me know if this is a known issue and what I can do?

I don’t have apple care and I don’t have the money to repair the back of the iPhone through Apple.

Thanks