Good evening folks. I know this will sound nuts, but I recently leased a new 2019 Tesla Model 3 long range. The car is amazing. I leased it in central CA where we don't have much weather, and other than a few odd issues that have all be explained and/or resolved, I took it on a road trip to southern Oregon. Today, it snowed pretty heavily. The car ran amazingly well on the messy roads, but this evening at about 4:25 pm PT I parked it in a parking space at the theater that had maybe a 3 or 4% incline. I backed the car in and the tires spun a little as I tried to get all the way up into the spot, but I felt in control the entire time. When I was in the spot, I put the car in P and put on the parking brake, and exited the vehicle. As I was exiting -- and as my 12 year old son was exiting the front passenger seat, the car started to roll forward. At first I thought it might be sliding (which shouldn't happen, but it was snowy), but as I jumped into the car in a panic I swear the wheels were turning. I looked at the display and clearly saw the P and the red Parking Brake symbol, as did an adult riding in the rear. I estimate the car moved a good 12 inches and would have continued rolling had I not jumped in and manually pressed the brakes. I put the car into reverse, backed up again, and again put the car into P with the Parking Brake on. Everything seemed fine, and so I had my passengers exit the vehicle again. My son got out this time without an issue, but when the passenger on the right rear exited, the same thing happened (no foot on the brake; car clearly in P with the red Parking Brake symbol on). I immediately hit the brake, had everyone exit, and then moved the car to a different parking spot. Obviously, this is very alarming. I can't believe it's a defect with the car, but has anyone had a similar situation? Outside air temp was about 33, and the snow on the ground was very slushy, not at all icy. I tried to see if my cameras caught the event, but I don't think they did. I also watched as an SUV parked in the same spot I was in and they drove in, parked, got out, and went on their way with not so much as a pause. Any ideas?