Quick Scan after updates causing system slow down and CPU usage stays at 14-16% until reboot

Quick Scan is scheduled for 3:30am, however, Quick Scan also scans after every Norton 360 update, which seems to always happen in the evenings when I'm using my computer. Quick Scan after updates causing system slows down and Norton 360 CPU usage stays at 14-16% until reboot. How can I disable Quick Scan after updates?