Flood and Freeze Sensor regularly goes online, then back offline almost exactly 12 hours later

We have two flood and freeze sensors and one of continues to go online and offliine. After being online, it will almost every time go offline exactly 12 hours later. You can see this in the event history of the device. It will take anywhere from 8 hrs to 5 days to go back online. Do I need to ask for this device to be replaced? We have no problems with the second device, located only a few feet (but another room) from the problem device.