This points to a range or connectivity issue. Let's figure it out together:

The very first thing to try is Update Neighbor Nodes. This is a helpful troubleshoot feature in Vera's interface that allows you to refresh the connections between hub and devices. It may help Vera find the most efficient route to your ZSE18 Motion Sensor. Here's how to do it:

1. Use a computer to log into GetVera.com and select your hub.
2. From the Dashboard, select Settings
3. Select Z-Wave Settings
4. Click on the Advanced tab
5. At the bottom of the advanced tab, you'll see a GO button to run the “Update Neighbor Nodes”. The process can take several minutes or over an hour depending on the size of your Z-Wave network.

Let's say Updating Neighbor Nodes didn't help. Next, exclude it  and re-include it within 3 feet of Vera. If the sensor connects and stays connected this time around, it's possible the previous location is out of Vera's range or there are too many interferences around.

Another thing to try is to exclude and re-include the Motion Sensor from the installation location. Similar to the idea behind Update Neighbor Nodes, it's possible that Vera hasn't found the best route to communicate with the switch. This can sometimes be caused by including a device near the hub but then moving it away to be installed. 

We also recommend checking out this short troubleshoot guide about optimizing installation locations and how Z-Wave range works.  

If you've tried all the above and nothing helps, reach out to us!