[quote user="Duilio Tacconi"]
You have to be sure that you are running the latest platform and application hotfixes for NAV 2018 (currently CU 29). it is crucial to merge all application objects in order to work appropriately with the latest platform bits.
Once you have secured that you could double check if JQ / Task Scheduler is working fine.
Typically in that range of non working hours, there might be some SQL Maintenance plan that is running such as rebuilding indexes or statistics or something on this flavor. These could interfere with the normal task scheduler activity.
If you need to run a scheduled tasks only within a range of hours I guess you have to check if setting earliest start date and end date might match what you would like to achieve. Otherwise you have to be in touch with your CSP Partner or reseller to customize and tailor the application at your needs.
Last but not least, you might investigate if this blog suits your needs demiliani.com/.../
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Thanks for your reply, Duilio Tacconi.
This is the setup for the JQ: 
Everything is up to date and working fine, but the JQ still stops a bit before midnight. We it be possible to split the JQ, so it runs 21-23 and again 02-09?