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I had the OP's problem, too. I tried converting books individually, or even in batches of two or three, and it worked fine. All of the replies seem to be spot on ... except for one thing ...
... I overwork my PC all the time, and no other program results in my computer completely shutting down. That includes rendering and conversion of 3d, audio, and video, as well as hardcore gaming.
What that means to me is that the makers of Calibre fail to protect against certain conditions that these other programs do.
So, contrary to this being perceived as a "personal problem" (hardware), I consider this a software bug.
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