I've seen this happen a few times since I updated to GS expansion, and I was wondering if anyone else has also noticed this phenomena. I'll be courting a city state over the course of the game, adding an envoy or two every 10-20 turns as I can, eventually to suzerain a couple. I'll get to a point where I have 2 or 3 envoys more than the next leader, and then all of a sudden some turn I'll find that city state immediately flip suzerains and find that I'm now 3 envoys behind that competing leader. Sometimes this turns into the city state declaring war on me when the turn before they we my friend. Would anyone know how this is possible? Is it a bug? Some obscure legitimate game mechanic that was added to GS? Or perhaps some new magical cheat added by the devs to give the AI the ability to compete? I can't recall ever seeing this happen before I upgraded to GS, so I'm baffled by these events, but I can say I think I've seen it three times so far in the last two GS games I've played, so I feel I need to ask what could be going on.