This is JUST a thought, and I have no idea if it would work, but could it be that people who do this have no new experiences or ideas to relate to others and so they replay the same stories just to contribute to the conversation? If so, maybe a change of scenery would do the trick. Like, going out somewhere new, a new hobby, a good book or movie, something to broaden your horizons, give you something fresh & new to talk about. Maybe that would get your mind "unstuck" on the same topic?? I don't know.