I've not noticed the sensor heat up, for me live view is only on for 5 to 10 seconds at the start of my imaging run(to check focus) and then there's only about 2 or 3 seconds between exposures, most of which is the last exposure image review before live view kicks in again for a fraction of a second before the shutter opens again. It doesn't get enough time to heat up. Tho it might if the exposure lengths are very short.
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