If none else works, try connecting directly from your modem (not your router) to your console. You can even try calling your provider, and investigating in software to track your packet loss. This will determine if too much is being dropped from your connection to Bungie's servers, and from where. You can usually work out a solution from there. It wouldn't hurt posting your router/modem model and provider, as some specific providers continue to encounter problems connecting to Destiny smoothly. https://www.bungie.net/en/Support/Troubleshoot?oid=12915