Earlier quoted context omitted.
Is there anything notable about the terrain at that point? A sharp turn, bumpy road, etc.
Long slow bend on completely flat road, 40mph. No braking or acceleration for a quarter mile each direction. The road is like that for miles with some lights, traffic circles, etc... Only warnings in one spot. I really didn't believe my wife, or thought maybe it was happening a few times when she made a regular trip like getting drive thru coffee and coming right back. But then we ran a bunch of errands all afternoon…
If you are making a turn the centrifugal force will push the fluid away from the axis of rotation. There is likely a level sensor only on one side of the tank, so the turn might push the fluid away from the sensor enough to trigger a warning.
The sensor likely has a time component to avoid triggering every time you make a turn, but if this bend is long enough, maybe the fluid is displaced long enough that it overcomes that minimum time.