This is the most likely cause for Ryzen-based systems experiencing idle resets. It is confirmed by observing that the system crashes specifically while idling or during low-power states. Verification is achieved by modifying the GRUB boot parameters to include 'idle=nomwait processor.max_cstate=5' and observing if the system remains stable over several days. If the resets cease with these parameters applied, it confirms the processor is failing to transition correctly into deep low-power C-states supported by the current BIOS/kernel configuration.
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