So, my Roadster has a new oddity; while stopped at a traffic light (foot firmly on brake), I have several times now felt a slight bump or two, as if something was nudging the Roadster. It doesn't happen often, so I don't think I can take it to Tesla. Everything else is normal. (It reminds me of what my 2001 Prius used to do, if anyone here ever had one.) If anyone has had this happen, or has a notion of what it could be, I'd appreciate your input.