If this is a VM, I'm guessing it's somehow corrupted. If possible, I'm wondering if restoring an earlier snapshot of the VM is the way to go. If not, build a fresh MAS VM and restore the DB from this MAS - hopefully from before this happened.
Even though we have a VM MAS 3.0 and an physical AWC 3.0, I still manually backup the DBs of each once a month - same with our 5000. Beginning of every month. It's one of the few manual un-automated things I do.