NAV 2016: Consolidation freezes if selecting multiple Business Units to Import

Hi,
We are having a problem with consolidation functionality in NAV 2016.
When we are running the consolidation process and we don't select specific Business Units to import (running process for all Units in a single go), NAV randomly 'freezes' during the process (it will stop at a GL Account). When you start the process again, it will run and then randomly stop at another GL Account.
When you run the process and only select single Business Units to import, it works perfectly.
Any ideas why this could be happening will be greatly appreciated.
Regards,
Ben