Motion sensor 2nd gen eats batteries

Hi all, have a 2nd gen motion sensor in the corner of the living room. This unit is eating it’s batteries every 2-3 days. It is a high traffic area. Tried resetting to factory settings and what not. Everything works fine except for the battery drain.Whilst in disarmed mode it keeps track of all movements. What can I do except removing the unit? My former alarm used a beacon (sort of ping) when disarmed to tell the base station it was still there, but did not use the motion sensor.