What's happening with grabs?

Recently returned into a game and noticed one particular thing. How the hell escape grabs? I mean I've been playin since E and F versions of the game and Z's DOES NOT grab so often, i swear the Effin Tough guys grab you once and you're done for good. So basically i am askin is there a way to tweak the code so they wouldn't grab every singe move? (Also noticed that Z that have cutthroat ability also do it every single turn)