I am on the San Francisco Bay Area. I was having a leisurely country drive downhill when I felt a jolt akin to downshifting in an ICE car, then my dashboard showed, “Regenerative Braking Disengaged. Deceleration decreased.” It lasted for about an hour until I got to a Supercharger on my way home. The RB was restored afterwards.
It was the first time I experienced my P85 without RB and it was not a bad experience. For one thing: the car rolled much further at all speeds on residual momentum than that in ICE cars that I drove, including Porsche Panamera 4S and Mercedes SL63.
Bringing my car in soon for servicing.