MerlintheMad
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It sounds like the bolsters are tied to the four hour reset for trip info. Probably if four hours elapse between "trips" the bolsters won't reset to the driver's selected seat positions. Why this quirk would occur is of course unanswerable by any of us.This is not the issue in this case. At least in my car, the bolsters open up when I shut the car off, I believe this is normal operation. Where it becomes an oddity is when you let the car sit overnight, the bolsters do not go back to the tight position, but any subsequent restarts of the car throughout that day result in the bolsters tightening upon startup.
It is possibly this is by design since it happens so consistently, but not sure of why they would do that.