Crane Using Time Tables

I'm having trouble trying to figure this one out. I've got 4 cranes, each using their own time table. As a crane goes on its "scheduled down", it is still holding on to a container waiting to be resumed.

I haven't had any luck using the "stop input" down function. I've also tried creating a task sequence (preempt_not), but I think the crane is looking at the entire hatch as its current task, rather than the single container.

Is there a way for the crane to finish unloading/loading the current single container before going on break?

Thanks for any help!