The battery is low which is why it does that. Replace the battery as soon as it does it and do not unplug and then plug back in to make it fire again because it may cause the box to lock up. You need to be running 9.6v and over . I have used 3s lipo's in mine since I bought it with no problems running it on those batteries. Nothing to worry about as it is just a safety cut off for the battery monitoring.
