When playing on my Paladin, Amiellia on Pagle in Cata classic I was fighting Anub’arak as the tank. Was fighting and on about the second section of the fight and I ended up through the floor. This has been an ongoing bug since at least May 13th. This has happened to my mom as well a week or so ago.
I died and had to run back while everyone else was stuck dealing with the final boss without the tank. Not a great experience.