There are several pending lawsuits related to battery issues. This isn't the thread for them -- it was only incidentally mentioned as the regen is likely related to those battery issues, as yet unknown because Tesla has not said anything directly. But many of us are seeing the evidence (some more than others).
If you're really unaware of this controversy, I encourage you to look around the forums and comment there-- I'm not interested in debating it here all over again.
As I recall, one of the distinguishing characteristics-- the goals-- as espoused by Elon, was that Tesla would be different in their treatment of their customers than other manufacturers. Saying they are the same is faint praise, I guess. I expected better-- and indeed, we got it for a while (the seat belt bolt inspections, the under nose battery shield retrofits, etc.).