My 6 pro has been shutting down [...] while I'm in a sauna.
But my Note 10 plus never even mentioned anything to me ever even with full brightness. Thanks for the help
Interesting that your Note 10 Plus works in a sauna-environment. I would definitely call that an extreme situation where no phones needs to properly work, after all we are talking about an ambient temperature of ~
65°C to 90°C, that's much hotter than even a desert. Most commercial products only operate up until 70° Celsius, Industrial usually up to 85°, Military ones even higher.
Personally I would never/have never taken my phone inside a sauna out of fear it might get damaged, after all it's a thousand dollar product. Treating it with care and caution is usually a wise choice, if longevity is of any concern.
Most smartphone (and desktop) processors can only take about ~100 Degrees Celsius (internal, chip temperature), before they throttle down into the abyss and try to cool down (to prevent permanent damage). But if they are in a sauna... there is no cooling down, lol. Afterall they lack a dedicated fan. As an example: It's a situation comparable with your ambient room temperature in the summer - if you have 30° Celsius in your room, but outside it's 40°, your room of course will not cool down, but heat up even more. ESPECIALLY not if you have several heaters on (= processor, display, et cetera).
That's why it's quite the achievement of your Note 10 to properly function in that kind of situation, that seems like a well-balanced phone in terms of heat/cooling. Props to Samsung in that case.
According to several reports in this forum, Tensor can get quite toasty, even in a normal environment. It shutting down in a sauna does not surprise me. There's probably nothing that you can do here, expect switch the phone or hope for a Google firmware update that lowers the coreclock.