Hi there, if you want some backstory, read these:
Cox Line Quality Issues - Regular Upstream packet loss - Internet - Internet Forum - Cox Support Forums
Line quality issues are back again... - I...
During my [Cox Contractor] service call yesterday, they replaced the line from the pole to the house. There was no change. They said they couldn't escalate it due to a ticket already being entered two days ago.
I called Cox, and they had me switch modems back from Cox's own Arris TM3402A to my own Arris CM8200A (also DOCSIS 3.1) to see if anything improved. It didn't, except I got a slight boost (1-2 dB) on my signal levels. S/N is good also at around 40 dB on most bonded channels.
Next thing I know, there's an outage notification in the Cox app:
Once the notification was cleared, I set away my Pingplotter again.... it looks like it was great overnight, and then after 10 this morning it all went to heck again: