Random full system crashes

Thats awful ThatKidOverTher3​ 

Im no expert and a bit difficult to help with so little detail. But i have had numerous issues sorting out both my own laptop and my sons aging pc, to get Apex to run nicely.

The stuttering sound sounds like a hard drive having a fit. Do you have a hd or an ssd? How old is it?

If its a hd, then a culprit might be it needs a full defrag, or is just too full. I find when a hd goes over 50% there can be issues. I'd also run scandisk looking for and fixing errors on the drive.

Defraggler is free and a imo very good defragger. Do not use it on an ssd.

I do a full defrag about every 4 months, otherwise a file defrag monthly.

Defraggler

I use Speccy to keep an eye on the gpu heat during the game. Also free.

I put an extra silent exhaust fan on my sons pc, as well as redoing the cpu paste. That got 10 degrees off the heat. 

Speccy

A windows update set the hd to sleep after 20 min. Might be worth checking that is set to never.

I clean his pc internally, gently with a hoover and small brush, putting in a bit of plastic to stop the fans spinning while cleaning. 

I put all the graphics load onto the nvidia.

Is there plenty of air around the pc?

I use taskmanager to stop unnecessary running background services. I also deleted unnecessary ones.