Rdcotton
I totally understand how confusing this could be, and I'm glad to hear you are being proactive in checking the connected devices. Are you using any new apps to performs backups, or new streaming services?
You can use the Panoramic Wifi app to configure profiles and monitor time online to see if it can help narrow down anything unusual. This won't give a usage breakdown of actual usage by profile or device, but might help you gain insight into how your data is being used based on the activities you'd use devices for. You can learn more about Active Time Alerts and Active Time Details at https://www.cox.com/residential/support/cox-panoramic-wifi-app-features.html. You can also reference your Data usage meter under and click the Data usage activities button to see how your usage is being categorized to see if this information helps narrow things down for you.