Problem
A batch is taking too long to export. You can move the unexported transactions from the old batch to a new one and try to export the new batch.
Solution
Go to the batch you have trouble exporting.
Unpost the batch.
Unbatch the pending transactions from that batch.
Create a new batch for pending transactions.
Move the pending transactions from the old batch to the new batch.
Post the new batch with the moved transactions.
Export the new batch.
If you are still having issues, contact Technical Support.