Thanks for the feedback! It is difficult to get multiple reprimands but not impossible. If players leave paperwork hanging about and don't pursue the appropriate downtime actions, all it would take is a few bad die rolls and one bad mission to start racking up paperwork and therefore reprimands (which is also contingent on the preferences of the players, which consequences are dished out, what the genre is, etc). We also didn't want player characters to become unexpectedly unplayable due to office politics. Getting a 4th power is a much showier, dramatic exit from the game. But the threat of reprimands means there are consequences, no matter how rare they may seem.
Also being removed from the Bureau could just be a plot development that makes sense in the story of your game, or the result of a complication during an action roll.