After a freezing cold night last night with a very severe frost l thought it might be a problem starting the car this morning.
But the biggest problem was getting in it!
Used the button on the key to unlock the doors and switch the alarm off as usual which worked ok then it locked itself again but the alarm stayed off.Tried again several times but got same result.
Ended up having to de-ice the locks and use the key to unlock.
Now after a few hours and its all thawed out everythings working again as normal.
i reckon either the front passenger door or the drivers door wasn't unlocking properly (frozen) or had a frozen 'i'm unlocked' sensor. when unlocking.. the thinks there's a problem and so reverts to locking all doors again.
Once had this problem with a Tipo. It turned out to be the passenger side operating rod was touching the door skin and when it the temp dropped it froze to the door. A small bend in the rod so it cleared the door panel and no more problems