Navara D40 2012 3.0 V6 Alarm issue

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Good evening all,
I'm posting this in case anyone has had same issue.
For some strange reason my alarm has started just going off for no reason.
They replaced the horn and connections (Fitting a non genuine horn)
It has been a local dealer.
They changed BCM (With Genuine Nissan replacement)
Bonnet Switch (With Genuine Nissan replacement)
4 Door switches (With Genuine Nissan replacement)
brought it home and within 10 mins of being home locked its gone off again.
Has anyone else had same issue ?

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[Old.Tony]

The dealer would have followed procedures to link the NATS with the keys after replacing the BCM. I wonder if a door isn't locking properly?

If they've only just done the work, they'll have a warranty on it. I'd get them to fix it.