My dreams seem to crash like your internet browser would. They seem to come across something that they don't like (say...becoming lucid...or even something very exciting or out of place in a dream), then terminate. Is this because the mind naturally want a dream to be like real life? Is the key to trick your mind into thinking that what is happening is normal? A program crashes because it encounters a fatal error- is that excitement? Is that the main reason for dream crashing?