Data Deploy script stops mid-way with no error

System

We have a workflow that calls a data deploy script. Most of the time the script executes just fine, but occasionally, the script suddenly stops without deploying the metadata to the database. The odd thing is that, according to the log, the script may fail at different points -- and it never provides an error. I've attached a consolidated log of when it works when it stops. Any thoughts about what might be happening?