The next best step in [troubleshooting your Contact Sensor](https://support.ring.com/hc/en-us/articles/360042311972-Troubleshooting-your-Contact-Sensor-2nd-generation-) is to try removing it and re-adding it in the Ring app. 1. Remove the back cover from the device. 2. Remove the batteries from the device. 3. In the Ring app, tap **Menu** , then tap **Devices** , then tap **Alarm Base Station** , then tap **Base Station** . 4. Tap the **Gear icon** on the top right corner, then tap **Advanced Options** , then tap **Z-Wave** , then tap **Remove Z-Wave Device** . ***Note: Do not tap “Reset Z-Wave Network”. This will remove your entire Ring Alarm network and you’ll need to reset every device.*** 5. Tap **Remove** and the app will say “Removing device, Listening for device to remove”. 6. Insert the batteries into the device. The device should be removed successfully and you may now set up the device. If this still doesn’t work, you may need to factory reset the Contact Sensor, using the steps in the linked article above. If this does not resolve your concerns, please give our support team a call at one of the numbers available [here](https://support.ring.com/hc/en-us/articles/213608406). If you are outside of the US, please visit [here ](https://support.ring.com/hc/en-gb/articles/213608406)to see how to contact support.

What we need to know is why? Rather than start over resetting everything. All the sensors in my house went offline today.

Cameras and lights still work but no alarm sensors.

M