I received an alert that I only have10% data remaining for the next 29 days. Over 5GB of data were used from a tablet that is turned off most of the day. So, the day my billing cycle starts, I'm practicality out of data. I typically only use 3 GB a month for all combined devices. When I look at the line breakdown for the device in question, it says it's unavailable, technical difficulties. Anyone have this problem?