A trigger that has tripped me up in the past is happiness.
As strange as it sounds, when I start to feel too "good", my AV starts doing cartwheels around my brain trying to get my attention. I'm not sure if it's some perverse need to self-sabotage, or needing to "amplify" my good mood with a substance to keep it going, but I've relapsed many times from this state of mind.
Either way, I know now when I need to be extremely vigilant.