I've been having this issue for the last 2 years, also on comcast. I live in cali used to get ~12ms ping to coeurl lobby where my character is but now my avg is 18-24ms.

Problems seem to only start after patch days and can last from 2 days all the way to 2 months later. I tracert most of the time and its always the Comcast node right before NTT that seems to be the issue. There have been a few times where the first NTT node was the problem but the internet issues were also more widespread that day affecting more than Comcast and isp's that are using Comcast lines.

I've tried different VPN's and pretty much every sensible route leads through a comcast clusters before you hit NTT from where I live. Comcast has a monopoly on the lines in my area and I have a feeling no matter what I do my traffic will always route through that problem node cluster to reach SE servers.

I'm starting to think NTT refused to pay comcast shakedown money and thats why we are cursed with constant packet issues.