My non-HC permadeath party (no hires, no AH, no ship buffs, no store, etc. etc. but we just play elite) sometimes gets these. Once (not in HC) it happened in Butcher's path jumping off a barrel to floor and bang! Dead! Had FF on, it was not a laggy day, so not sure what happens. There does not seem to be any pattern to it and it is very rare.
But sudden death due to massive falling damage from a short fall has been around for many years. I dunno about the teleport death though, that sounds like sort of a different version of the bug.