SQl Server Agent "Unexpected Termination" with no error details

Hi,

I have built an SSIS project where one main package refers to and carries out over 30 other packages in succession. Each package does the same job - uses an excel sheet as a source to then update the same data stored in a SQL Server database table. Once the data is updated (new records added existing ones updated) the excel sheet is deleted and then created again using the data from the database table. Every step in the SSIS packages completes before moving onto the next step, as far as I'm aware it shouldn't be accessing / writing to the same source file at the same time

This has been executed on our development server manually (still to attempt running as a scheduled job on our dev server) and has worked fine. However when running this on our test server using a test SQL server agent test service account the process only goes so far until it stops due to an "Unexpected termination". I doubt permissions are the problem as the excel files are stored in one single folder and the process manages to succeed until when it stops. So up until this point the execution has successfully managed to access the source files and the database without any problems.

I've tried getting it to create a dump file but has given no further useful information other than a possible exception in the mini dump file mentioning ISServerExec.exe and a code of 0xC0000005. I have had something similar happen before when sourcing from Excel files for a different SSIS project in the end we switched to CSV files and the "Unexpected termination" hasn't happened since. Would love to change sources to CSV but would mean rewrite of entire SSIS project.

Thanks for any help or suggestions as I'm out of ideas.