In my model, I have 4 processors and am using standard logic for the operator to place and pick up objects from each processor. For some reason, when I run my model for 24 hours consecutively, 3/4 of my processors are running at 93% and 1 of them is running at 8%. I slowed down my model and realized that there is an object at that one processor finished, yet the operator does not go pick the item up, and instead goes to the other processors. How can I fix this?