Like many early adopters, I too had a bunch of failed Vertex 2 drives and sometimes observed similar things. I think this might be because the drive lost some updates to its FTL about where it wrote new data, which could plausibly lead to both new files vanishing and changes to existing ones being apparently undone.
Yes, the Sandforce controller in Vertex 2 was a real unstable beast. I lost maybe three or four Vertex 2 drives. All under warranty, except the last one which suddenly vanished and was not detected anymore.
OCZ does not exist anymore. Not sure of if this was one of the causes, but I would otherwise never buy a drive from them again.
