Hello ChristophRe,
thanks for response, i have change my strategy in order to support also the notify on smartphone, now the sensor is activate for ever, and i have added two action on the specific menu when a movement is raised during night and the end of movement, in this way i can have the notify and the bulb that work togheder.
May be that with latest firmware all work as spected also with the previouse settings, but now i have reach a good stability and so i think to leave as is.