Stress definitely triggers me, but you can't always avoid that. I can't locate anything more specific than stress though - I can have two equally stressful situations and one will cause me to disassociate and the other won't. There's no common thread. It's pretty unpredictable.

It's definitely not a physical thing though - I'm aware 100% that the world hasn't actually changed. I'm aware 100% that everything is as it's always been, it's like having your emotions go numb I guess, and since emotional connections help us relate to our bodies, it makes me feel a physicaly odd sensation