I would restart router, wait till its back on line then restart panel.
Is the ethernet cable a pre made one or did the installer make it? I would test this also just to make sure.
The CP-25 was the first panel Orisec bought out around 9 years ago and hasn't been made for the past 4 years or so. You could update the panel to a CP-20 with lan card as that is the updated version?