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I think the problem is the lock itself. The locks are quite well known that the mechanics in the lock fail and the small servomotor for the central locking.
Then the lock sometimes works and sometimes doesn't. Disconnecting the battery can have an effect, because the lock usually doesn't know if it's open or closed, by disconnecting the battery the value is reset.
Please check the cables in the lead-through between A pillar and door to see if they are broken there. ( This error is rare and unlikely, but I don't want the lock to be changed without having checked it first.
If this is ok, replace the door lock.
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