Add me to another frustrated Cox HSI customer! After dealing with the packet loss and high jitter issue for weeks, I went ahead filed FCC informal compliant on last Sat (7-day PingPlotter tracegraph attached showing problem starting from Hop2).
https://forums.cox.com/forum_home/internet_forum/f/internet-forum/25181/az-chandler---constant-packet-loss
Today I received a call from Cox rep in their Exec Office. He admitted that the node over-saturation is indeed the problem. He said my neighborhood node has 500+ people on it while typically should only have 200-300 (I'd argue it should be even lesser than that).
I asked him when the upgrade (a note was left from Cox in my Cox Inbox indicating "infrastructure upgrade" was coming; this was Sep 2019) could happen, and he said it was supposed to be on 02/19/20 but for some reason it did't. He promised to get back to me on the schedule update. We'll see.
What worries me - even after node split, there is still 260+ people on the same node... I really don't think Cox infrastructure capacity is keeping up with the greater Phoenix area population growth.