Whilst in the S of France last month I closed the caravan door from the outside. When I tried to open it again it was locked. Bit of a panick as both sets of keys were inside the van. Thought I would have to send SHMBO onto the roof to gain entry via the roof light which was the only window open. After a few tries I managed to force the door handle round and 'overcome' the lock. From then on we kept a key outside the caravan at all times. It has done it again maybe 4 or 5 times since. It is completely random and have spent a fair time trying to 'make' it happen to no avail. Has anyone else come accross this snag? Van is a 2009 Anvondale dart.