[ref5678]

to whomever stated "It's 4th down in overtime and you're still warning players?" that should be irrelevant. You call the game the same way in the first quarter, as you do through the final whistle. If you would warn them in the beginning of the game, you need to continue that in overtime, pending that they have not already been warned for this infraction. If they had already been warned then nail them, but you nor anyone else on this thread knows what was said between player and official.