For as long as I've had my 2016 Model S (6 months), the key fob's buttons have never worked. When I have it in my pocket and approach the car, the car opens fine. Because of this, it really hasn't been too big of an issue. I did take apart the key to see if there was some corrosion, but it looked very clean to me. The car does have MCU 2, so I'm wondering if it's something to do with that retrofit that perhaps messed up the key fob. Does anyone have any ideas short of just buying a new one?