[lUserAMD]

EPYCs have many cores, and most applications (including those with long uptime requirements) use only a subset of the cores continuously. So it is totally normal for some of the cores to go to deep sleep C6 during phases of lower load. It will cause server operators headaches, when those cores don't come back eventually. Reboots help, disabling C6 in the (already running) OS also helps.

Please note, that we are not talking about a core sleeping for three years. We are talking about a core going to deep sleep, when the system has been up for three years or longer.