To reboot your standalone router take these steps:
Remove the power cable from your modem and the batteries along with any other hardware.
Release the power cable from your Spectrum router too.
Wait for a minute and allow things to cool down a bit.
Now, reinsert the batteries and plug the power cord back into the modem.
Wait for two minutes to allow the modem to rev-up.
The modem’s lights should slowly restore to confirm it is powered and connected.
Now, plug-in your Spectrum router to the power supply and wait for two minutes for it to boot up. Once display lights turn on, you will note that you have successfully achieved a Spectrum router red light fix.
Check your internet connection to confirm you are back online.
I hope these steps will be helpful!
Mark Wilson