There is a break in the fiber signal. Check the cable or call your ISP.
Check the sticker on the back/bottom of your specific device. Zte F6107a Manual
The ZTE F6107a is a high-performance Dual-Band Wi-Fi 6 Optical Network Terminal (ONT) designed to deliver ultra-fast fiber internet to homes and small offices. Because it supports the latest 802.11ax standards, it provides significantly better coverage and speed than older models. 🛠️ ZTE F6107a Hardware Overview There is a break in the fiber signal