The earliest recollection of this bug is traced back to PAN-OS 8.1.19 - January 09, 2024. This bug is fixed in PAN-OS versions 9.1.8, 8.1.19. ( PA-7000 Series firewalls only ) Fixed an issue where Network Processing Cards (NPC) took longer than expected or failed to boot. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-19-addressed-issues https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-8-addressed-issues