I wouldn't even try without jack stands. If you buy jack stands look for long version from craftsman and then a floor jack at some point that will raise it up that high.

I suggest checking the pan temp when you experience the problem to see if it is in normal range. Overheating can cause trans to do weird stuff. Laser temp readers are one of those tools you won't need often but is important and justified as a small reduction in the labor cost you are saving because you DIY.

You may have a problem with the internal heat sensor which is built into the wiring harness that you can replace when you have the pan off.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas