Jurassic World DLC problems

I downloaded the DLC, and I enjoyed it so much. But then later on,the game lags for no reason even when my connection is good, and it's super annoying: Vehicles move slower than normal, eating food takes 30 seconds or so, reloading tranquilizer darts repeats for no reason, the dinosaurs barely moved, and sometimes when I capture the dinosaur, the crate disappears forever until when I get a new one, the crate held with a dinosaur appears. Can you explain why does this happen?