WiFi Cutting Out on Nighthawk CAX80

Hi,

I got my CAX80 replaced this past Friday with another CAX80 and my download signal is weak regardless of whether or not I am wired or over WiFi and the WiFi cuts in and out frequently. I've rebooted this router and the signal in every manner possible. I did a factory reset, hard reset, rebooted via the routerlogin.net website and rebooted via the Xfinity app. I called Xfinity and they sent a new signal and are going to send a tech out (again) today to see if there is something they missed. When I run a cable diagnostic all 32 of my down channels are locked and 5 of the 8 up channels are locked with no correction codes. At this point I have no idea if it is this gateway or the ISP because I did "upgrade" service with my ISP which prompted me to "upgrade" my gateway from the C7000v2 to this CAX80 so there are 2 variables. However, I should mention the last time my ISP came to my house they found no issues on their end. 

Has anyone else had this issue? What was the resolution? I haven't had an issue with my previous service and my C7000v2 although it was starting to struggle with the bandwidth as we incorporated more devices and I work from home mostly now.

Model: Netgear Nighthawk CAX80

Firmware: v2.1.3.5

OS: Well I have apple and windows devices connecting to this gateway