I have a player whose percentage dropped from 100% to 90% in 4 games. I have never seen a position player drop this fast. His durability is a 56 but i have other who are in the 50's and 60's that haven't dropped that fast. What could the problem be?

 Dennis Chang (L)   this is the player in question.

He played full-time in ST, and full time so far this season.  37 straight games without a rest.  That's your problem.

I'm guessing that your other players with durability in the 50's and 60's haven't been pushed as hard as Chang.

When you have position players with low durability, you have to give them occasional days off throughout the season.  But once they dip under 100%, they're going to fatigue quickly.

thanks.