history: I work in a call center that has 4 members on the team and is based on a queue.  Once you finish a call you go to the back of the queue.  On a regular basis I will get off of a call and the others will log out of the queue so I am back to the top again. My coworkers sometimes put more work on me than necessary. Why do you think they do that? They don't want to talk on the phone and can get away with it for a while.
current: That's not fair and probably very frustrating for you. You need to say something to them.
next: I agree, I'm actually up for a new position so if that happens they'll actually have to do work for a change.