Random Alarm - No History in Home Mode

SInce installing ring home alarm with an outside motion camera a week ago, we have had several seemingly random alarms. The duration is usually 1-2 seconds; the device is in home mode and motion detection is all swicted to not monitored, only the camera is in motion record mode. When the alarm sounds, there is no active history in the App.Firmware is all up to date... I read a post about intermittent wifi so turned off wifi / diconnected internet but this did not trigger the alarm.All seems totally random and quite frutsrtaing when it occurs in the middle of the night.