Update: As of 11:05PM we believe we have identified and mitigated a router bug causing the issue. We will troubleshoot further with our vendor to ensure the situation does not repeat.
Starting around 6:30PM this evening, a subset of business and residential copper served customers in San Francisco may be seeing short bursts of packet loss approximately every 30 minutes. We are currently working to diagnose the cause and will provide update upon resolution.
-Network Engineering