Sometimes this can be caused by incorrect settings on the next bundle to be processed, you can check the next bundle in the queue by following the below steps:
Open Bundle+ Monitor
Filter the Progress by "Ready to bundle"
Sort by date in reverse chronological order (oldest to newest) (date created)
The item with the oldest created date should be the next one in the queue
Once you have identified which one is next - please check the bundle by running it manually from the case, and if it prompts for action IE "You have selected page numbering however there are no sections" Then you must adjust the numbering to a setting which will not prompt for action otherwise it will cause the ATM to get stuck.
Please contact support and reference the title of this article if the above steps do not remedy the issue.