Occams razor - you bumped the button when it was in your pocket. I have two 20 year old Craftsman garage door openers and neither of them have ever been triggered by the car.When I put the car into park, it triggers the garage door opener. First time bringing it home, I wasn't sure if it would fit through the door so I stopped, put it park to look and the garage door started coming down and hit the hood!!! I backed out and put the car in park again and it triggered the garage door again!
It scratched the hood but it's should buff out. Still horrible for the first day of ownership.
Parking outside until I can figure this out...
I used to keep my non-MME key loose in my pocket. I discovered that if you held the unlock button for 5 seconds it would open all the windows and the sunroof.So top tip for everyone else. Don't take the garage door opener out of your old car and just shove it in your pocket. I guess you always fret the first scratch on a new car so I got this out of the way early and it looks like it will buff out.