You can be disconnected from Moen's Smart Sprinkler Controller if there is a power outage and / or lost to your Wi-Fi connection.
To find out what you should know when there's a power outage to your Smart Sprinkler Controller, please go to Did your power go out?.
To find out what you should do when there is a Wi-Fi connection issue with your Smart Sprinkler Controller, please go to Can't connect you Smart Sprinkler to Wi-Fi?