Team A, 2nd down and 6. On the last play of the 3rd quarter, A38 gains 3 yards. After the play the down marker is flipped to 4th down. Following a brief pause to ensure no reason to defer ending the period, the referee holds the ball over his head to signify the end of the quarter. Both teams change ends of the field and the chains are reversed. Before the ball is snapped for the first play of the 4th quarter, Team A's coach notifies the game officials that he believes there is an error in the down.