I know that there is a common issue with a corroded cable under the drivers seat which causes issues with the central locking. I had this issue and it presented as intermittent issues with central locking and sometimes one of the front doors would not lock properly.
There is a wiring loom wrapped in black automotive tape under the drivers seat and if you unwrap this you might find a heavily corroded cable. Not sure if this could be related to your issue, but it occurs so frequently that it might be worth ruling out.
I have read about that, but so far the intermittancy has gone with the replacement of the lock, but if the fault returns that will be the next thing to check.
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