Why does usbguard.service stops intermittently ?

Issue

• The usbguard.service keep failing intermittently with AuditBackend=LinuxAudit

  # systemctl status usbguard.service
  ● usbguard.service - USBGuard daemon
  Loaded: loaded (/usr/lib/systemd/system/usbguard.service; enabled; vendor preset: disabled)
  Active: failed (Result: exit-code) since Mon 2020-12-30 09:45:47 GMT; 34min ago
  Docs: man:usbguard-daemon(8)
  Process: 27618 ExecStart=/usr/sbin/usbguard-daemon -f -s -c /etc/usbguard/usbguard-daemon.conf -d (code=exited, status=1/FAILURE)
  Main PID: 26732
  
  Dec 30 09:45:47 node1.example.com systemd[1]: usbguard.service: Control process exited, code=exited status=1
  Dec 30 09:45:47 node1.example.com systemd[1]: usbguard.service: Failed with result 'exit-code'.
  Dec 30 09:45:47 node1.example.com systemd[1]: Failed to start USBGuard daemon.