Upper Downstream channels not locking

I have been having intermittent internet issues for about a year. Last year a tech was dispatched and after being in my home for 8 hours he left. I haven't had the time or patience to schedule another tech visit. The last month we were rebooting our XFi modem once or twice daily to keep the internet up. I finally went out and purchased a Netgear CM700 modem and TP-Link AX3000 router. Initial setup went smoothly, had an issue with the Downstream bonding light blinking. I spoke with Xfinity support and she advised me that the Downstream light flashing, meant that the modem was syncing with my Wi-Fi devices. After several minutes of explaining to her that a downstream light on a modem is in no way related to Wi-Fi scanning and that her response was absolutely absurd. She followed with an "If you say so". I then ended the chat and started looking for my own answers elsewhere. I also see a lot of UnCorrectables. Please see my signals pasted below: