This isn't the same as the ball falling off the tee. When it falls off the tee, there is an outside force (usually wind) that caused it. When a punter whiffs, it's his own d@mn fault. Encroachment (I'm betting the rest of the team crossed the line), DOG (I'm also betting he didn't get it picked up and kicked within 25 seconds). If no one crossed the line and AND he got another kick off within 25 seconds, I can't find a foul, unless you think it was intentionally done to throw off the receiving team. If so, I guess you would have to go with unfair act.
But it's not nothing.