Do we even know what the fault or faults are yet? There hasn't been a clear answer still. I saw Asus dropped another bios update over the weekend for more microcode adjustments, but again no clear answer as to what causes the failures.
The underlying issue seems to be an instruction on the CPU reads from an invalid memory location due to failing to read (as in it doesn't even bother trying) from a location which contains a pointer to the memory location for the data the instruction is going to use. Which then causes a fault. Another incarnation is where the register for the next CPU instruction contains a pointer to an invalid location to execute.
Generally this will be due insufficient voltage for the CPU to be stable, but beyond that what is actually going on I don't think anyone has narrowed down publicly.
EDIT: The degradation largely seems to be happening under circumstances where the CPU is continuing to run voltages and frequencies not compatible with the thermal situation - though that might not be the reason why it is degrading but rather those circumstances might be pushing on a weakness, made worse by some motherboards. But is not why there is a problem in the first place.
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