I am running OPNsense 21.1.2-amd64 on a ProtectLI Vault FW4B. The startup and reboot sounds are clear. When the device is running I occasionally (fairly frequently) several times an hour get a scratchy/clicky sound. Is this probably hardware or software? If software is there a workaround. I just got the device and set it up today. I am a newbie.