When I first bought my 200 it would circulate tiny bubbles in the cooling system until warm and since I had no history on the bike except it mostly sat and didn't get ridden. I pulled the head off to have a look and the head "O" rings were flat and not very flexible. I believe it could have gradually lost coolant until low enough to have a catastrophic overheat if I had left it as is. Yours could have been in the same situation. Once they get to the tipping point it all happens fast. I wouldn't blame yourself, if you ride them they will break and if you don't they will rot. It's way more fun breaking them.
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