We had a brief power outage to our home over night. When trying to connect to the internet in the morning, we had no connection, or intermittent connections. I rebooted the SP8200 and also did a reset. I contacted our provider, Breezeline, who said there were no outages in the area. They trying to reset the connect from their end twice. The connection would come back briefly and then fail.
Finally the provider eventually said that it was the modem, and that I had to contact the manufacturer, Arris, to determine the problem. This is where we stand at the moment.