Howdy there,
Not sure if it is a bug of the pre5 in 1.12, but already had two times the following issue (computer system is windows 10). The first time happened yesterday and the second time today :
While playing, the computer closes itself at once, without preventing. It is like someone took off the plug of the computer. In previous minecraft versions, it never happened. I am wondering if it is coming from minecraft or maybe from the two latests update of windows.
I don't think that's related to Minecraft in any way since Minecraft is not able to shut down your system in any way as far as I know.
You should check your computer.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki