[steve8714]

Reboot. That’s what the nerds always tell me, right after the question, “What did you do?”

[MayflowerMadam]

Unplug power from the modem.
Unplug power from the router.
Wait 30+ seconds.
Then, plug in the modem.
Wait 30 seconds.
Next, plug in the router.
Wait about a minute — until the appropriate lights are back.

That the reboot that works for me on Spectrum-Charter.