You'll get a Signal Loss alarm app notification if your sensor has not communicated with the app for 20 minutes and you are not receiving any glucose alarms.
To restore connection after a signal loss alarm with the FreeStyle Libre 3 system, please wait 2-4 minutes after coming back into range. The FreeStyle Libre 3 system range is within 33 feet, unobstructed.
You can also try turning Bluetooth OFF then ON again. If that doesn't work, try turning your phone OFF then ON again.
If you continue receiving the Signal Loss alarm after following the steps above, please contact Customer Care at 855-632-8658. We are available via phone 7 days a week from 8 AM – 8 PM Eastern Time, excluding holidays.