Opty

Keenetic Giga 1011, OS 4.1.7. Connected to a box where the optical fiber comes in, and from there a twisted pair cable goes to the router. After the initial setup, which took a few minutes to connect the router to the outside world, everything works fine. But upon reboot, the "System Monitor" shows the cable connection as "No Connection". And it only appears after about 10-15 minutes. Previously, I had a Keenetic Speedster, and everything was perfect with it. Do you have any ideas on how this can be fixed?