I have checked both options, and again no more detection.May be because I have nothing defined for the zone crossing.
I have been using the hot spot for one year now and I am quite happy with it, in spite of the false alarms,
triggered during the night by 2 or 3 cars light beams coming onto the spot.
( for this detection I just record videos, without any sound alarm, nor sms, email, etc)
Anyway, I will try zone crossing.
.