If you have the fob on a ring with other keys make sure a flat one is next to the fob.
I had the same trouble until I moved the key with a fat "handle" on it so my flat house key was next to the fob buttons. 3 years now and not a single unwanted trunk opening.
The problem seems to be that no one on this side of the Atlantic has a part number for the steering wheel with paddles.
Any part numbers you could supply for the needed parts would be much appreciated.