At the risk of sounding obvious, have you checked to see if one of your sensors might be dirty? I've experienced this once after a long winter road trip after the car dried off. I cleaned off my bumper and brushed out the little groove around the sensor and it was fine. Worth checking.

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Current Fleet:
2018 328d Xdrive Sport Wagon
2011 X5 Xdrive 35d
1973 2002 tii
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Past loves:
2015 i3 REX
2011 535i Xdrive
2005 X5 4.4i
2003 530i
1999 528i
1995 525i