When attempting to ping the firewall, it works at times but it also stops responding randomly
Issue
Intermittently losing the ability to ping the firewall can be caused by a duplicate IP address on the network.
Examine the ARP table for the management interface on the firewall as a workstation pings it. If no ARP entry appears for that workstation, or if it takes a long time for the ARP entry to appear, it is likely that another device is using the same IP address as the firewall's management IP address.
Resolution
Change the management IP address on the firewall or on the device using the same IP address.