So I have a bunch of Lowes Iris Motion Sensors, Iris Contact Sensors and Smartthings Multisense Sensors (Motion). They are all zigbee and recognized as SmartSense Motion Sensor in the IDE.
On Friday I noticed a few of them were no longer recognized on my system so I threw it out to ST Support who provided a litany of reasons such as low battery and wifi interference. On Saturday I remedied the problem by simply removing and reinstalling batteries into the devices.
Yesterday at 4:30pm all these sensors went offline. I cannot get them online again. I have rebooted and reset the hub. I removed batteries. On the Lowes sensors I can see the green light when there is motion/contact but it is deeply troubling that every zigbee contact/motion sensor in the house would fail at 4:30 in the afternoon like that.