I believe this is called G5 thermal runaway when the fans go full
blast. It's not related to sleep or network AFAIK. Some people have
said Norton software is often responsible, so if you have anything
from Norton, uninstall it. You can also try resetting the PMU:
<http://www.felipecruz.com/reset-pmu-and-non-volatile-ram-g5.php>
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