Hi all, I'm having issues with my PC

Also, obligatory "I'm on mobile" so sorry in advance

PC specs:

Windows 10 x64

AMD Ryzen 3600 3.6GHz 6 core CPU

Corsair H115i RGB Platinum AIO

ASUS ROG STRIX B450-F ATX AM4 Gaming Motherboard

Corsair Vengeance RGB Pro 16GBx4

Seagate Barracuda Compute 2TB 3.5" 7200RPM HDD

Gigabyte GeForce RTX 2070 8GB Windforce 2x GPU

Corsair RM (2019) 750W 80 Gold Certified Power Supply

So a couple of days ago, I was playing COD with some buddies and my pc rebooted itself, mid-game. Ever since then, no matter what game I'm playing, it reboots itself, sometimes a few minutes after loading the game, sometimes only a few seconds. My mobo completely resets itself.

Here's what I've done so far:

-Uninstalled and reinstalled GPU and drivers

-Checked airflow and heat (both seem fine)

-Repaired files for OS

-Ran a full CHKDSK and everything came back fine

I'm thinking it might be my power supply spiking, but would like some feedback if I can get it. Thanks in advance

EDIT: currently going through Corsair Support to see if I can get a new power supply