How do I fix slow speeds in a fiber network? Clean connectors, check for attenuation, and upgrade outdated hardware. When should I. What is the most common cause of fiber network outages? Physical damage to fiber cables, such as cuts or bends, is the leading cause. What does the “LOS” LED on a. If everyone you live with is streaming, gaming, or downloading large files simultaneously, it can overload your network. Your cables are damaged or loose. You're using the wrong Ethernet. From the kitchen, there is a CAT7 cable that runs through the walls to the storage room where there is a router (ASUS Wireless N900 RT-66U Dual Band).