I am experiencing a perplexing event, provinces I conquered, some times generations ago, are getting their independence without rebelling. In my current Byzantine game I am the Holy Roman Emperor, as I said areas I've integrated into the Empire(s) and have cores in are somehow gaining instant independence. I've only seen it happen once but I couldn't read the message that came up because the game speed was on it's fastest and I closed the messaged accidentally while trying to command a navy.