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It COULD be the humidity (moisture in the computer). Your only real "solution" is to power it down, store it somewhere DRY for a while (buy a dehumidifier for the computer room if need be) and hope.
The maximum operating temperature for your system is 35°C, and it can handle up to 90% relative humidity. However, if the temperature changes overnight such that the humidity condenses on the computer, that could be a problem.
High humidity (and hot) for extended periods of time...with problems...has been posted about before (but not often). So I would say that it is possible...but I guess hard to prove...other than referring to the official Apple operating environment specs.
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