So many things could have happened. Telling you what happened over the internet is rather silly. I have a few ideas, but these are nearly educated guesses.
What you could have is a slipped liner. You wont see it everytime. Also, the liner could be cracked and only opens when the motor is hot.
Also, it could be a cracked head.
It's just so hard to say. Hopfully it's just a head problem!!
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