Tech visited a few days ago and confirmed the issue was seen at the tap and was not a problem in my equipment. He opened a plant maintenance ticket. As of a few hours ago, it appears that the packet loss has been reduced from an average of 20% down to an average of about 3.5%. T3 timeouts have been reduced from multiple times per hour to once every hour or two. I was hoping that they would have also found and fixed whatever was causing the remaining T3 timeouts and packet loss but as I mentioned, a truly clean connection seems to no longer be possible. Since Cox has the monopoly on decent speeds in my area I suppose I should be happy with whatever I can get.
UPDATE: As of a few hours ago the T3 timeouts stopped completely and I'm seeing a clean connection (0% packets loss up/down). I'll have to keep an eye on it to see if it's an intermittent noise source that's only active during the day, but for the moment it looks like they might have fixed it completely. I really hope so.
