[url=https://www.bungie.net/en/Help/Article/11790]BEAVER[/url] is an error code indicating that you're experiencing problems connecting to other players. Switching from WiFi to a wired Ethernet cable, or making sure your [url=https://www.bungie.net/en/Help/Troubleshoot?oid=13610]NAT is properly configured[/url] can help reduce the number of occurrences. Keep in mind that you should only have UPnP enabled, port forwarding configured, or your console/PC in the DMZ; using more than one solution may cause conflicts.