Its uncommon to see that many sensors go into malfunction at one time, but it is possible, and for a variety of reasons (not just hardware failure).
More information on Malfunction and how to resolve can be found in the below guide:
When troubleshooting the 9 sensors, there is no need to delete all sensors, Sensors can be deleted individually.
If you have checked the battery, distance and the material the sensor is mounted on, deleting and re-adding the sensors may help to resolve the issue.
Individual sensors can be deleted via the following means.
Navigate to Settings > Advanced Settings > Enter the Installer Code (Default is 1111) > Installation > Devices > Security Sensor > Delete Sensor. From there just click the check box next to each sensor you wish to remove.