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Huh. For some reason my old Surfboard connected to Charter decided to do this for a while:

1970-01-01 00:00:11 3-Critical R002.0 No Ranging Response received - T3 time-out (US 1)
1970-01-01 00:00:04 6-Notice M571.1 Ethernet link up - ready to pass packets
1970-01-01 00:02:23 6-Notice M573.0 Modem Is Shutting Down and Rebooting...
1970-01-01 00:02:23 3-Critical R004.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance o
1970-01-01 00:01:50 3-Critical R005.0 Started Unicast Maintenance Ranging - No Response received - T3 time-out

With repeated reboots from the lights which tried to come on then reset. What? It's back now so I'm going to dismiss it as a temporary blip. If it comes back Charter direct from Broadband Reports looks like a great support resource.