If you have a Spectrum Router and see that the Spectrum Router blinking red, it means that either the router has connection issues with the modem or there’s an issue at the ISP’s end. Resolving such issues requires you to go through the below-mentioned steps:
Switch off your router and disconnect the power adapter from the electric socket.
Connect the power adapter of the router back to the electric socket and turn the router on.
If the problem persists, check if the Ethernet cable connecting the modem and the router is in proper condition. If the cable has any physical damages, replace it with a new one.