Another thing that struck me is maybe it's time to boot into a small stress testing image and see if it's more of a hardware issue. It might also be a power supply issue, where as the load goes up, your power supply can't keep the voltage up and the system fails that way? There's the 'stress-ng' package for beating on systems. And I think I've used 'sysrecue' in the past to boot up systems and run stress tests. Getting the regular OS out of the way with something lower level and simpler to stress test the hardware is a good idea. https://www.stresslinux.org/sl/ Might be another good option. Good luck! John