Alarm System going off randomly

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Hey guys (and gals),

Since this is my first post on this site, Hi y'all, I'm Chris from a small town in Western Germany (close to Bonn) driving an 06 BMW X5 (E53) with the 3.0L Diesel Engine and AC-Schnitzer mod.
This is me and her in Hartlepool, UK 2 weeks ago:



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So, I have come here to this great forum I have been reading for a while looking for help...
Lately, my Alarm has been going off randomly and I have no idea why.
The Battery is brand new and I use a Ctek XS7000 charger to maintain its charge when the car sits for longer periods (like 5 days). Funny enough, the alarm has never gone off at home (neither while connected to the charger nor while not) but goes off while I'm at work a lot.
And I never see anything out the ordinary when I go to look (small company, fenced in with 8 foot fence). Yesterday I was standing right next to the car (maybe like 6 feet) when the alarm went off. There was nothing touching or moving the car at all.
The only thing I noticed was the 'comfort indicator panel' (for my battery charger) blinking red (indicating low battery charge).

Have you had similar problems or have any ideas for me where I could start to look?
I have the following interface cable:
Ediabas/INPA OBD2 interface - ADS/OBD Ediabas/Inpa Interface für alle Versionen - do-it-auto
(Sorry, I think its in German, but it's ADS and OBD-II Compatible) and I have the right software for it too, just am not very used to it yet...
Is there a way (maybe using INPA) to read WHY the alarm went off?


Best wishes,
Chris