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0e1f616
(Get the code!)
Just had similar episodes as what is described here.
My CPU apparently was close to overheating (though the maximum temperature I afterwards observed was 95°C, with a specified high/max of 100°C). The Ubuntu 18.04 on my laptop (Asus Zenbook UX301LA) consistently became unresponsive after starting high-cpu-usage tasks (compiling something using ninja-build); after stopping the thermald service, the unresponsiveness was gone even when running the high-cpu-usage tasks for a long time.
The unresponsiveness is quite severe: Though I did manage one time to switch to the tty1 and log in there, I could never enter any more commands there (waiting for approximately a minute or so...). I eventually always had to resort to more harsh methods of restarting the laptop.