wow, I just finished building my PC and got the exact same experience too, at first I thought it was because I undervolted the cpu too much or because of the xmp profiles, so I just restore the whole bios settings
but today suddenly the weird freeze happened again, until I realized that the freeze always happens whenever I have nzxt cam opens in the background
I've just uninstalled it today after find out that a lot of people seems to have problems with nzxt cam seemingly just crash the entire system