Hi all, Over the last 18 months, the door actuators on all 4 doors of my 2008 A4 B8 Avant have failed, preventing me from opening the doors from outside. I swapped them out with new ones which was easy enough, but 6 months on, one of the new actuators failed and now 9 months on another of the new actuators has failed.

Can anyone give a clue as to why they keep failing? Its obviously a massive inconvenience to keep on replacing them. I did notice that when I replaced the last one it was wet so I'm assuming there is some sort of water ingress that is shorting out the electrical component. If so, how can I figure out where this water is coming from? Is this something anyone has encountered before? Any suggestions would be much appreciated