Alarm sensor keeps randomly tripping, steps to take to diagnose?

I have an alarm system with a sensor on the garage door that was installed by the previous owner. Last year I had a couple of nights where the alarm went off and the culprit was this garage door. Its probably set the alarm off about 4 times in the last year,all at night.

The sensor is hereand my first question is about the location of the sensors, is this likely to be causing it? Alternatively, there are a lot of spiders around that door, could a spider walking between sensors trigger it? Any other suggestions of where to start to identify why it’s triggering?

submitted by /u/Farquea
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May 19, 2023
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