ethernet ports lights on for 10..30 sec than off for 10..30 sec
That sounds more like it's rebooting...? You can try opening a ticket at go.netgate.com.
Netgate device was sold with this cable
All the models we've bought recently do. I vaguely recall it being an option in the past? I may be misremembering that though. I always leave it in its plastic bag and write on the bag so no one throws it in the cable drawer and it is lost in the neverending sea of cables. :)