[s-type] Doors locking, - and unlocking

I am seeking some advice from the S-type community:

Recently the doors will not lock by using the remote. Leaving the car they
do lock (by the remote), - but unlocks the next second. By itself!

The same happens when starting the drive. Once I reach 5 mph or so, - the
doors lock, - and unlock the next second.

I manage to lock the doors by using the key (except on one occation).

I will appreciate any tips on where to look for the fault. A micro-switch
somewhere that disable the locking system to operate normally?

Thanks in advance.

William, 01’ S type Sport 3.0 L, 120k Km

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In reply to a message from William D Stinessen - hjemmme sent Tue 24 Jan 2012:

Hi William - Very strange
One idea. Try your other remote to outrule fault in the remote.
The locking after a short driving is normal.
Look in the other topics about locking.
Leo–
LeoN - Denmark
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In reply to a message from Leo Nyg sent Wed 25 Jan 2012:

I suspect it is a micro switch problem, in one of your door locks,
in that the door is not fully locking or in some other way the
unlock switch is being tripped and the signal is sent to unlock all
the other doors.–
XK120 FHC, Mark V saloon, XJ12L Series II, S-Type 3.0
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Thanks for your comments and advice Rob and Leo.

I will pursue the micro switch theory. Seems likely since I also experienced
a similar problem earlier, - occasionally the drivers door would not
unlock/open from the inside. Either I have had to use the remote, or open
another door. A faulty micro-switch in the drivers door?
Possibly/probably…

Best, William

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In reply to a message from William D Stinessen - hjemmme sent Thu 26 Jan 2012:

If you double lock, you can t open the from the inside with the
handle. Look into your Handbook.
Leo–
LeoN - Denmark
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William, can you confirm what the solution is. My car has an identical problem.

Sit in the car with all the doors unlocked. Then lock the car with the fob and see which lock doesn’t move. You have to spot this before the doors unlock again. Obviously, this is the one that needs to be investigated. Unless the system sees all the locks closed it will unlock straight away. This will also happen on DAL.
The microswitches do fail and bits of the locking gear break off. I have replaced the microswitches rather than purchasing a new lock. I do not think the gear can be repaired successfully.