As mentioned, it was not usually manifesting as power outage. Random components would fail. Presumably because the PSU was able to keep the system nominally "ru

As mentioned, it was not usually manifesting as power outage. Random components would fail. Presumably because the PSU was able to keep the system nominally "running" but not delivering the right power to components. I also experienced some random reboots, things that also looked to me like bad memory... I suspected bad memory at some point. But swapping the PSU did the trick.