We're using the bulk API to updates accounts and leads. However we're seeing data loss and cannot seem to find the source of the issue.

We don't see any errors on our side. The logs lack output from the end of the script, specifically the results aren't logged nor is the final line saying the script is done.

When we take a look at the bulk data load jobs, no records failed. But we do have a bit of jobs that are in progress that are days old. I don't think that is the cause of it.

When we send it individually we see that all the data gets through.

Script: