Starting the Clock

[dmp237]

Situation: A is up by 7 points, 1:45 left in the game on A's 10 yard line. After running play by A (no first down, inbounds), the referee blows ball ready for play and clock starts. After 25 seconds, A has not snapped the ball, delay of game is called, clock is stopped. After penalty enforcement, ball is blow ready for play, and referee starts the clock. What's to prevent A from taking consecutive delay of game penalties until the clock runs out and the game is over? Am I missing something, or is this possible?