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I have got the same problem, LR specialist here in Sydney said it could be a number of things but suggested to start with the BECM as dust ingress causes havoc with them, and is the most likely cause.
To this end he suggested to take it out and give it a good blow out, door locks didn't rate high on probable causes.
Mines going in to get new blend motors tomorrow, I'll ask some more questions then.
Rob
Door latch micro switches .......
I have been experiencing a similar problem with my door locks jumping up and down on thier own. Mine is definitely heat related, has hardly happened at all through winter, but now it's warmer, it has started happening once again, specially if the car is left in the sun.
From what I've read, and others have already suggested, the drivers door latch is the culprit.
There are micro switches in there that can play up, as well as the latch itself becoming worn, causing a bit of slop which tells the doors to open...or close.
I'm going to replace my door latch when I get the chance, there's a guide here if you want to tackle it yourself: Replacement of door latch 4.0/4.6/p38A)
Yes, driver's door RHD latch.
Replaced mine (right hand front door LHD) and no more probs (ha ha).
It also fixed an intermittent problem with the tailgate not opening.
More then likely it is one of these two things.
The drivers door latch
Or the BECM.
If you're short on Money have a look at this part in our build were we delete the locking system.
Lucky8's Project P38