I understand speeds fluctuate and nothing beyond the 25/3 FCC "broadband definition" is promised.
The problems happen over ethernet and wireless, any website or service. down is 90-1200, and up is 0-40, have packet loss on all hops beyond the gateway every few minutes, ping is 0-2000, jitter goes up to 100.
They have been upgrading the node/network in my area and every few days there is a "We are working in your area to provide you with a more consistent internet experience" notice on Cox.com.
I think that 5 months without resolution is a bit much, and beyond expecting someone to be patient and wait it out.
Everything has been notated by techs (directly at the tap) on the account to the point Cox employees are surprised when they pull up my account and see all the notes, but because its intermittent they are unable to pinpoint the source of the ingress.
I can connect to the houses ATT Uverse or the T-Mobile Home internet and the above issues disappear, but both services only offer slower speeds then Gigablast when its working correctly.
The Gateway was replaced last month, as was the ethernet cord with the one in the same box. Drivers are up to date, Windows install is fresh, have tried another motherboard, and another PC. Usually there isn’t more then 2 devices using the connection at once.
The tap plate was replaced, and a new drop was ran, outside of the piece that’s thru side of house, there are no splitters inside, outside, or a wall plate. Noise has been cleared from the line twice so far to my knowledge.
Then you probably need to have another tech out, try requesting a senior tech, They (Tech Support) cannot guarantee one, but they can certainly request one for you.
