PC randomly shuts off

The frequency is random, the system is not overheating (ran core temp and all readings were ok) and i can feel the airflow and its cool.

It happens regardless of what is being ran.

When it does happen sometimes the RGB on the RAM stays illuminated, when trying to power back up it sometimes flickers on and back off.

Im thinking some kind of PSU issue however its a 6 month old Corsair RM750x so not like its bad.

Is there anything i can do without any spare parts to see if it is another part (or software??) that is causing my issue?

Any help would be greatly appreciated.