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.