Smart Presence Sensor randomly "leaving" and "returning"

Battery life is fine on mine, but I still get random drop-offs with both the fob and the phone presence.

Using an idea from Digital monkey, I am changing over the way I use presence sensing for all activities. I’m now using dual devices at the geo-fence barrier, as well as a virtual presence sensor for better continuous occupancy indication.
Basically I’m trying to separate occupancy indication from the presence sensor device.

Details in the following topic: