I have had the same thing happen to me too. It was because the key fob in my pocket was being activated by my pants when I went to sit down in the car.
'11 AW E93 335i Conv.
'11 OS E89 Z4 (Sold)
'10 AW E92 M3 (Sold)
Contact me for Custom L
work, Rear Fog Light Buttons and Headlight Switches. Euro Style too.