Amazingly, when I woke up this morning. A 2nd SSD is exhibiting exactly the same behavior as the last one.

Its not the new one I put in, but surely this can't be a coincidence? And more likely points to a motherboard problem. I do not know what to do a this stage. I have one more SSD I could cannibalize from anoter machine, but my head tells me the machine itself is a problem now. I'll plug in the first failed SSD to another linux machine and see if it exhibits any errors at all.