ADT/ST Motion sensor crazy out

Living room motion sensor reports motion frequently (8-10 hrs) apparently without any reason while ADT/ST panel es in Protect Away alarm mode, but alarm has not been activated (thanks God) we are in vacation trip an in 1 day 3 motion report of the sensor but without triggering the alarm, Any idea? Thanks in advance (electric storm cut the powerhub was off line, then on line again before all these started)