I remember when
Audi went through this. This was before computers ran automobile sub-systems. IIRC, that's where the "step on the brake while shifting into drive" procedure came from. It took Audi more than 15 years to recover from that debacle, even though no one ever proved definitively that there was a problem (in fact, some in the media helped fabricate evidence). But with computer systems running the show, anything is possible. Computer programs can get so complex that unknown behaviors can occur with no way of being able to predict it or even find it!! This sounds like a
heisenbug or borhbug.
Mike