I'm on Vashon Island, in the Seattle/Tacoma area. Just after 11 AM today I noticed my internet service was down. Power-cycled my SB8200, noticed that its lights come up all green (previously download light would go blue). Still no internet.
Self-service troubleshooter says everything's fine, except that it can't talk to my modem. Trying to reboot my modem via the troubleshooter reports success, but nothing changes (and my modem does not restart).
Called Xfinity support, was told that since everything looks fine on their end and my modem is not their equipment, it's Not Their Problem.
Connected to the modem's Event Log, noticed a "docsDevResetNow" event at 11:10 AM (i.e. right when my service stopped working). Did a factory reset on the modem; again, every light comes up green, but no internet service. Event log now shows:
"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;..."
"Honoring MDD; IP provisioning mode = IPv6"
"SW Download INIT - Via Config file d11_m_sb8200_blastpro_c01.cm"
"MDD message timeout;..."
"SW Upgrade Failed Before Download - Server not Present"
I've gone through this process (sometimes power-cycling, sometimes factory resetting) 5 or more times this afternoon, always with the same results.
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