What are the chances that setting to XMP in the BIOS can play a big part on this instability? Afterall
, XMP is considered a form of overclocking as in it runs the memory at speeds faster than what the CPU officially supports, and
I wouldn't be surpised if there are people who build their own systems and don't pay attention to what the memory controller on the CPU actually supports and just buy the fastest memory they can afford and that motherboard they buy supports and then set to XMP in the BIOS to get their memory to run at it's advertised speed, even if they don't have the intention of overclocking. Also I used to own a motherboard that if I enabled XMP, it would overclock the all-core turbo speed to it's single-core turbo speed for all core loads.