Anthony,
Jacci has a good point. You can find the 'batch_mode' in the log files of the SIS Imports page.
To pinpoint the cause, you will need to find the exact import that caused the students to be dropped. Here's a little help on viewing log files
When you find the upload that caused the drop, look for a field that says "batch_mode". If it's anything other than "batch_mode": null, that could be the culprit.
The cause could also come from a status change in the enrollments.csv file.
Take a look at the file that was uploaded (if you still have it on your server). Specifically in the enrollments.csv file. You will probably find something other than 'active' in the status field.
I expect there is something in the query that created the file that changed the enrollment status at the end of the term. To prevent it from happening again, you will want to pay attention to the query that created the file before the end of the next term.
I hope this helps!
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