HonestReview
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Not sure what that means, SD cards tend to get quite hot when in use. I guess 85 the card temperature, not air temperature, so it's maximum is probably similar to the rated maximum of the camera, which I think is given as air temperature.
I suspect that the shutdown temperature for the camera is actually set mainly based on what temperature the memory cards become unreliable, in order to avoid people blaming the camera for card write errors.
85C / 185F is the maximum rating supported by Sandisk MicroSD cards. So if the temperature is exceeding 85C, the conditions exceed the recommended temperature threshold. Clearly the camera shutting off is not related to the Memory Card. The Camera would simply beep or say insert memory card if the SD card were the issue. Instead, the camera is powering down spontaneously, without exiting the current file be written. Resulting in the last video file being corrupt as the camera overheats.
So this issue has nothing to do with the Memory Card itself.