Key remote not unlocking the Pajero when cold

[Mitsu Fan]

Good day all.
A weird situation presented itself when we went camping recently.
Obviously the Paj stood outside, and trying to unlock it early morning, it would not unlock. I had to unlock manually, and start her up to stop the alarm from screaming longer.
The Paj started fine, and the remote was fine for the rest of the day.
Same thing the next morning, and fine for the rest of the day.
It has not done it since, as it has been parked in the garage.
It does not like the cold?
Any one else experience this?
Cheers