I went round in circles with this back in January but only thought about it today after seeing a car on ebay that 610 pointed out.
Some safranes can lock and unlock themselves. This is pretty rare but when it happens it's almost as if the car is haunted. You can be stood there right next to it and hear it locking / unlocking.
This is actually caused by condensation up in the roof panel above the switches for the doors, lights, sunroof and passenger reading light.
Sinply grab a torx 25 size screwdriver / bit, take the panel down and using a paper towel, wipe the roof of the car clean from the condensation (you'll probably find some parge drips). Then disconnect the switch plugs (which are vertical) and BLOW through them. You'll see a few small drops of water come out of the other side. You may want to turn the panel upside down too to let it dry for a few hours.
Finally, reconnect the plugs and switches and put the panel back up. You may want to consider putting a plastic sheet over the plug connectors to stop this happening again or a small sachet or salt up there to keep the thing from getting too damp in the first place. Be warned though, the sachet of salt will be next to the roof metal and although renault do put a sachet in the heating system, thats placed inside plastic and not next to the metal.
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