I’m in the exact same boat. You can’t do anything if you can’t connect to the admin interface.
Have you tried with different power outlet and power cord?
If yes, I suggest you to visit www.arris.com/consumersupport for further assistance.
I had the exact same thing happen this morning. Even holding in the rest button does nothing at all. Called support and someone from their tier 2 team is (allegedly) calling back “in the next few days”.
Same issue today with mine. Randomly lost service, Xfinity app said expect it back in an hour. About an hour and a half goes by I check the app again, no WiFi yet, oh the app say my modem is not responding, unplug for ten seconds, plug back in. My s33 is solid orange light, I unplug, count to ten and plug it back in. High pitched noise, alternating long orange, short pale green. IP login gets you no where. Posts here say go chat with support. Support is very firm I unplay and asked I verify no bodily harm or property damage, please do not plug it back in! Seems either a fire risk or something, they insistent about six times to leave it unplugged and they would “escalate” my request.
why is this happening this week to us? What happened? How long until I can get internet again, I shouldn’t have to go buy a new modem I have work to do and children to entertain.