Injuries...
Okay on a serious note I hate this. They should watch a game. How many times do defensive linemen get subbed in and out of games? That happens sometimes multiple times on a defensive series. For both package reasons and to keep them fresh. Hell Nick Perry is second in the NCAA with sacks right now and he is not even a starter! He is in on certain situations and when another DE is a little winded.
Same with linebackers. I dont see it as much in the secondary, but still its an issue.
Does anyone else also have the missing player issue? The one where a player will come out of the game and never come back in? I have it happen all the time in one of my dynasties. My guy will always come out in the fourth and never re enter. Sometimes even earlier. I have even tried putting the auto sub sliders down in the 20s for his position and still he does not come back.