I'm also experiencing major packet loss for any traffic that is routed through "Phoenix1.Level3.net" as shown in your screenshot. There are a handful of sites that basically won't load or are simply unusable due to the packet loss/slow speeds. This is definitely not an issue specific to my modem or router, as it happens on both the residential connection at my house AND an entirely separate Cox Business connection at my office 3 miles away. I have tried several different computers, bypassed all routers and switches, and rebooted modems. 100% an issue with Cox and/or Level 3.
I manage a web site that is hosted on WebHostingHub.com and I can't even access that site without switching over to a VPN or using my cellular connection. Extremely frustrating. I opened a support ticket with Cox over the phone yesterday but still haven't seen any improvement.