Slow speeds to gateway (Plan 1200mbps)

Good afternoon,. Speeds have not improved and we are still experiencing high ping and packet loss especially later on during the day. I've tried the possible solution of discharging the voltage on the coax cable however that did not seem to work. I believe that the issue has to do with possible Network congestion in the neighborhood causing this issue and not our house alone. As it happens at different times of the day. I've read online that other people have had issues with cable network congestion. 

We've had multiple technician visits and a supervisor a couple of times and the supervisor said that everything looks fine on their end. However even during the tech visits speeds are around 600mbps and they replaced the coax cable going from the house to the lockbox to the tap on the pole. Since the speeds drop throughout the day. I suspect it's due to a overload in the neighborhood that affects our zoom calls and packet loss while gaming. (Low speeds and higher ping)

Earlier today I talked with a lady who works for Xfinity she explained what the technicians wrote down / explained to her basically saying there was nothing on their end as they replaced the coax running to the house from the tap. As I stated. Basically saying theirs nothing else they can do on their end. 

  Also, this issue has been occurring ever since Xfinity upgraded the network in the area for the midsplit and faster upload speeds. Before the beginning of April everything worked well and we never had a serious issue with our network. I know speeds can drop but they shouldn't be dropping this much. Everyday. 

Adding that we switched out 2 gateways 

2 XB8

1 XB7 (currently on)

All screenshot are linked in the Google drive link below. 

https://drive.google.com/drive/folders/1hOcZOeNv1GOnqn7TFah16Y6pgWwhrPgq