Got it thanks. Support replied with the following for anyone else having similar problems:
Sorry about the trouble you’re having. The SmartSense Presence Tags are intentionally designed to go ‘off network’ (meaning departure events), so they can be impacted by external factors. In situations like this, we know the following steps can improve consistency.
Change the channel of your Wifi router to 11 or 1 (the frequency of your Wifi channel may affect the performance of the Presence Tag as they both operate on the same frequency)
If you have a SmartSense Motion or a SmartPower Outlet, plugging it in will extend the range and dependability of your network (thus making it easier for your Presence Tag to be detected)
Move your router and Hub farther apart if possible. This can reduce potential interference.
In some rare cases the SmartPower Outlets can cause issues for other Zigbee devices (like the presence tags). If you have one connected, the easiest way to test this is to simply unplug the outlet for a day and see if you get any more false positives. If that clears it up, we can work on troubleshooting the outlet.
One additional question, just for our insight, do you use an Apple TV, Sonos, or any other 2.4Ghz devices?
Let us know if these options help, or if you need any assistance. We’ll be glad to lend a hand.