My T100 is constantly detecting motion when nothing is there. 
 

I've had the unit for about a month and it actually seemed to be working fine until this week, when I noticed the lights being automated were staying on. 
turning off the automations still shows motion detection in the logs. 
The sensor is attached to a walll facing up a flight of stairs. 
I just removed it and placed it in a closed drawer and it's still triggering every 30s or so. 
I've removed the battery and testing it seems fine.