Check the battery health, also check the door jams; One of the door lock actuators or sensors that tells the vehicle doors are closed and turns off the dome light might not be working properly, the doors are locked but the pin might still interpret a door is ajar or being opened. A slight vibration from another vehicle driving by along with a bad door lock actuator / sensor will trigger the alarm all while the doors are fully locked.
Answers & Comments
Check the battery health, also check the door jams; One of the door lock actuators or sensors that tells the vehicle doors are closed and turns off the dome light might not be working properly, the doors are locked but the pin might still interpret a door is ajar or being opened. A slight vibration from another vehicle driving by along with a bad door lock actuator / sensor will trigger the alarm all while the doors are fully locked.
Check all your doors and boot switches are closing.Switch under bonnet not getting water in it.Put vaseline around the pin