Sorry for the question completely out of topic but you said you work for MSP, what is the MSP?

Nice update btw 👍

First, sorry for your loss. Regardless of the case, if they are really not working it is still a possible big data loss and hit on the pocket.

It is weird to happen at the same time. Have you checked them on another machine? Other SATA/SAS controller? If it is, for example, a power issue problem it may happen to other drivers soon too.

Maybe they have been powerfully hit by something?

Just trying to help with finding the culprit, since it is so unlikely that 3 have died in such a similar time frame.