just incase anyone else is having trouble with the android app and Libre 2; after always having had trouble scanning the sensor and blaming myself I have at last been told that the app is having trouble and they are doing everything to resolve the situation. I was sent 2 replacement sensors and after a third phone call a new reader, and the difference is incredible, and SO much more accurate and scans so easily; hope that helps someone! still don't know if its resolved yet (this was a week ago)