I had a similar issue on mine, potentially the same problem. There is a microswitch in the door latch which senses when the door is closed. This switch failed on both sides. If the system thinks the door is not closed it is impossible to lock the car. First you can lock it after the second or third attempt but eventually you won't be able to lock it at all. Replacing the microswitches wasn't sufficient in my case because the failing tab on the switch scored a groove on the rotating cylinder withing the latch that operates it. So I replaced both latches. I went with a cheap Chinese aftermarket latch, it's been perfectly fine so far and no adjustment was needed.
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