Presuming for the sake of discussion that the CPUs are overheating, that is a cooling issue, not a memory management issue. It's hypothetically possible that the additional I/O your system storage has to do when swap gets full and the system has to do more moving of data between swap and RAM is making the storage hardware toasty enough to overwhelm the thermal management hardware. Monitor your system temperature rather than system load when under this computational load to correlate shutdown with a temperature spike rather than a computational one. Ensure that your system fans are working cooperatively to keep air flowing rather than all pulling air into or exhausting air from the chassis. Ensure the heat sinks are properly installed.
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