I had a very similar issue. Samsung 860 Pro, system somehow got slower and slower until it froze. After a hard reboot, my partitions on 2 dynamic drives were go

I had a very similar issue. Samsung 860 Pro, system somehow got slower and slower until it froze. After a hard reboot, my partitions on 2 dynamic drives were gone. Easily restored with Testdisk, but that was a weird one. Never had it happen again.