There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Please stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions prefer the other forums within the support section. Before you post please read how to get help
To be honest, since Gloria I don't really see much need for hibernate, as it boots in under 20 seconds for me, so I recommend just shutting down. It sounds like it could be a hardware issue where the fan is difficult to start up again once stopped.
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