2025 Porsche Macan — service lifetime transmission fluid or leave it alone?

I'd want a measurement, not a hunch. Capture voltage while the 2025 Porsche Macan is actually failing — after it restarts you've lost the clue. That's the branch I'd chase this week. This is from a 2025 Porsche Macan in Denver with 12,500 miles. Learned this the expensive way on a previous car. No warning lights, which is why I'm documenting it.