Even if it's fatigue it's horrible. I can see changing the run style mid stride and slowing the ball carrier down that way like on Madden 09.. but this isn't even close to being like that. It definitely isn't fatigue though because I've had this happen on the opening kickoff before. I got to the outside and ran straight down the sideline and the glitch happened.
I think everyone who knows what I'm talking about will probably agree they added this to stop the amount of huge plays from happening for some stupid reason. That's exactly what it seems like to me. What other reason would they have to add something that allows you to get caught from behind no matter how fast your player is?