I just went out and checked and realised why I thought the lock in the door was connected, it's very easy to press the button on the key whilst turning it in the lock.
What makes it odder than just being in 1 spot, is the fact that it only happens when I have just pulled up, saturday this is about 7:15am and sunday 7:45am, 10 mins later after tea and toast, it works fine. When I drive home later on, and park at home, no problem. Maybe it is something that I do slightly differently on that journey, getting out the car etc that has an affect, I shall have to try and study my actions.
Normally, it works from 20+metres away, but on these mornings, standing right next to it no joy.
Most confusing.