A7000 Internet Disconnect Every Few Minutes

My brother currently has a Netgear A7000 Wifi USB adapter connected to his computer since hard wiring is not an option due to placement of router. He has Xfinity internet and currently just received the XB8 cable modem. Previous to receiving the XB8 he had the XB6 and the A7000 worked flawlessly without any issues. Upon receiving the XB8, he can connect to the internet but as soon as he starts to do anything intensive such as streaming, playing a game or watching Youtube videos the internet disconnects automatically. It will take some time to reconnect and then the same exact thing will happen. We have tried multiple fixes and cannot find a solution. We are unsure if this is a problem with the adapter or the router or both. He plugged in a random belkin wifi adapter that he had and no issues with connectivity were found. It has something to do with the A7000 and the new XB8. Fixes that we have tried are below. 

1. Disabled RunSWUSB

2. Set network profile to private

3. Uninstalled Netgear Genie and installed only the standalone driver

4. Turned off power saving option in device manager

5. Switched USB ports on computer

6. Took adapter off the dock and plugged it directly into the computer

7. Tried switching router settings from WPA3 to WPA2

8. Had another A7000 which we tried and did not work as well.

We tried looking EVERYWHERE for solutions and kept finding that the XB8 or XB7 were having issues with the A7000.