Thanks man it has gone away. I loaded XMP added 0.02v to the RAM as mines had a touch of instability at 3200 cl14 and disabled c states.
It's annoying as it ran for so long with zero issues at 3933mhz and then decides to throw 14k WHEA 19 events in a couple hour period.
It seems like I'm still having some sort of issue with my portable SSD and it's only doing 20MB/s.