Same/similar hardware and software is just meant as a catch-all. The clusters that are having issues are the in-between hardware generation for the clusters/servers that are working. Everything runs windows Server 2016 Datacenter, but the patch levels are different between the working and not-working servers.
I've looked at the MPIO configs, and it's set up the same and working as intended on all the servers. Logs in SnapDrive folder were really just a repeat of the error I posted originally.
I'll have to schedule some maintenance for patching then, sicne that seems to be the most obvious discrepecny. Was hoping to avoid reboots (boss is incredibly paranoid about them), but nothing else to be done.
Thansk for the suggestions.