I had a similar problem with my car. Alarm randomly sounding and occasional Alarm Service due messages. Eventually my battery went flat after leaving it for a week. From what i have found is that if the rechargeable alarm battery in the alarm sounder is goosed then it reverts to using the main battery to maintain the alarm thus eventually flattening the battery. I bought a replacement rechargeable battery pack and cut open the alarm sounder box and fitted the battery pack. It has been fine for almost 6 months now.
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