Hi... I have a P85+ that is about a month old. About a week ago, I noticed that the driver's side seat started to get loose, enough so that the seat will tilt down a few degrees under moderate braking (ie. fully releasing the accelerator under standard regen). The seat tilts back when the car comes to a complete stop. The motion is similar to adjusting the thigh tilt on the seat up and down - its that sort of motion in which the seat feels loose. I immediately brought my concern up to my local service center and they came back and said all Model S have a bit of play in the seat. I agreed with them since the loaner 85 I got had some play, but I would say not as much as my car. They told me to monitor it and if its continues, they will file a case with Tesla Engineering. I wanted to check in and see if anyone is experience a similar issue. I have 3 other cars, 2013 BMW M5, 2011 Porsche Panamera and a Mini Cooper S and none of them exhibit this degree of seat play. I love the car otherwise, but the loose seat feeling is very unsettling under braking.