Put me in the same camp of "I know it's the brake pedal as I can feel it with my toes when it's happening" (I exclusively wear flip flops for 8 months out of the year...) Something I THINK I am noticing, but could be totally crazy, is that the "Brake Hold" (HOLD) is becoming a bit more difficult to engage at stop lights. I feel like a year ago, it was a nice, short, simple-but-firm press to get it to HOLD. Now, I feel like I have to apply a lot more pressure and sort of hold it there for a bit longer, and even then, occasionally, it won't engage. (I also don't get to drive the car that often- my wife says it's the same as it ever was, so it could just be the difference of me confusing the way it feels with my 500e).