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E46 330i alarm going off randomly

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Hi everyone, my alarm keeps going off randomly. It started this afternoon (car parked in the garage) and I went out to unlock it but it kept ringing. After cycling locks to reset the alarm, it kept ringing until I disconnected the battery for a while. I reconnected the battery and as soon as I opened the bonnet, it went off again (with the car unlocked).

I read somewhere that it might be the bonnet sensor so I unplugged it and went for a drive and it still rang (yes, it rang during the drive) so now it's parked again. I locked it and disabled the motion sensors (double tap lock button) and it's quiet so far. Any thoughts as to what may be causing this?

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