I setup several emergency call beacons at a college (push a button, and 911 is immediately dialed, and a big blue light on the pole strobes, to help police find

I setup several emergency call beacons at a college (push a button, and 911 is immediately dialed, and a big blue light on the pole strobes, to help police find you). After 2 weeks of random alerts for a single beacon, we eventually determined it was the sun hitting the face of the device, expanding the button a bit. Rotated the face of the device 90 degrees, and never had an issue again.