Berker Alarmcentrale detector problem

[Jan T]

Hey,

I've have a Berker Alarmcentrale with some motion detectors and contacts.
The motion detector in the kitchen and in the living room weekly gives some 'fake' alarms ...
Most of the time, the motion detector in the kitchen triggers the alarm and some seconds (sometimes some minutes) later, the motion detector in the living also triggers the alarm. But until now, I could never find a thief to catch.
I use the Gira motion detector 1305 xx.
The question;how is it possible that I got so often a 'fake' alarm by 2 (two!) detectors at the same time (interval in some minutes).
I already switched the sensitivity to almost zero but no effect.
It's really annoying.

Thanks for suggestions

PS I'm new and not yet a specialist, but I learn fast :)
I understand German, but I'm not able to write it.

Jan
Belgium