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Random crashes on my machine
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64GB sounds plenty, but is there perhaps a slow men leak in a process?
Leave your PC running, run this in a terminal, and leave it:
Its a script that writes the time, and then the memory stats to logfile.txt.
Let it run until the PC stops responding, and then leave the PC a couple more hours.
When you reboot, have a look at the logfile, and see if the memory was growing at all. Also see if you get any date stamps after the PC stopped responding, because that might mean it was not fully crashed.
If it is a memory leak, the next step would be narrowing down which process.