Restarting your router, checking your modem connection, and resetting network settings often resolve the problem quickly. Compatible router: Verify that your router supports fiber optic input (look for an SFP or WAN port labeled. Fiber optic networks are celebrated for their speed and reliability, but even the best systems can encounter problems. When issues like signal loss, slow speeds, or intermittent connectivity arise, systematic troubleshooting is key. Despite multiple attempts, the Archer AX6000 v1. The blue light on top of the router spins around for a. The easiest and most common solution is to turn your router off and on again. Disable and re-enable Wi-Fi in your phone's Settings.