Priva has introduced a feature that monitors the length of time it takes for a valve to finish an irrigation cycle. This timer starts when the valve send a message to the water system that it wants to start. The timer ends when the valve has completed it's cycle.
By default, the time length is set to one hour. This is set in the alarms page of the irrigation valve screen. You may need to extend this time if an irrigation cycle normally takes longer than an hour. Another reason to increase this time is if you have many valves that are programmed to start at the same time and it normally takes a long time for all the valves to finish.