Hi,
I already had a similar issue on big project (2500imgs, more than 200 laser scans).
Step 1 : PSU
Do you have a sufficient PSU ? You can check your PSU capacity here : https://outervision.com/power-supply-calculator
Despite my PSU replacement (by a Corsair 1200W), i had continued with my issues.
Step 2 : RAM frequency
I have resolved my problem by adjust the RAM frequency regard to the CPU and the motherboard. From default, my RAM (64GB) was set to 3000MHz. I have fixed my crash issue by fix the RAM frequency to 2400MHz…
And since, never have a new crash…
If it can help you.
Good luck !