How to fix unstable 60 FPS when capturing at 3840x2160 (4K) using RGB24 or P010 on MSI X570 motherboard?

Enter BIOS and then to Settings -> Advanced -> Integrated Peripherals, and from there disable both the Onboard LAN Controller and the Onboard Wi-Fi Module Control. 

After disabling both of these, the Live Gamer 4K GC573 will receive a maximum payload size of 256 bytes as opposed 128 bytes it was receiving before.