Question Pc randomly shuts down or makes weird buzzing noise in my headset and freezes (I have to turn it off with the power button)

Dec 14, 2019
i5 8600k
GTX 1070
256 m.2 nvme drive
2tb Seagate hard drive
750 W Bronze PSU from EVGA (I know its overkill)
Hyper 212 Evo for cooling
Asus Prime Z370 A Mobo

The problem:
While doing light gaming, my PC will either shut off or freeze (Like literally, it's not just being really slow) and make a weird buzzing noise in my headset. In Prime 95 the thermals hit a max of 84C so cooling shouldn't be an issue (I also have 6 case fans so its not a lack of airflow). I don't think its the PSU but I wouldn't be surprised if it is. Sometimes the case fans connected to my MOBO (as opposed to Molex) won't spin and the PC won't boot, but it normally fixes itself after clearing the CMOS. Any tips or recommendations would be appreciated, TIA.