I think
lexluthermiester is right about the cpu degrading giving off the symptoms. If the memory controller (imc) is dying it would generally drop a memory channel completely sometimes the socket pins not connecting correctly to the memory dimms can cause this as well and last the worse case could be the board itself.
At least try taking out the cpu and inspect for burn marks/corroded pads and give it a clean with a soft rubber eraser but be careful not to knock off the caps on the back of the cpu.
And looking at the voltages for qpi that the cpu experienced pretty much it digging a grave for itself
SeanBeanDiesInTheEnd what memory are you using as it can be found in aida64 as I need to check it up on specs online
Is it this one you got installed
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