Yes, same thing is happening here! Since October our data usage has gone way up and we haven’t changed anything. This past billing cycle we used about 80% of our data, but that was bc I checked our data daily, turned our security cameras off and disconnected WiFi whenever possible. Such a pain!! All that monitoring and I still can’t figure out why the occasional high usage. Today I got on the app and discovered that we used over 300gb yesterday. My kids were playing a lot of Fortnite being on Christmas break, but 300gb???!!! 30% of our monthly data used in 1 day??! I called and messaged Cox last month and unfortunately they were no help.