So this actually just happened to me a few days ago. I was driving in the freeway then suddenly the car went into full limp mode and the message with engine overheat needs to cool. I open my hood and I see a bunch of coolant sprayed on top of the hood. Thought it wa a loose cap, so I just refilled with water after it cooled and it came back to normal. Brought to an indie shop and they found some codes that pretty much meant pump failure. It was the water pump. Finally replaced it and also thermostat. It's running fine again.
I have 58k miles on the 2012 35i.