Make sure your phone is closest to the primary earphone. To find out which earphone is primary:
- Check your Bluetooth pairing history and look at which of the two is showing “Connected”.
- To connect the other earphone as the primary, place them back in the case and take out the desired earphone first--several seconds before taking out the other
- In very open environments with no reflections (walls/buildings/ceilings) the wireless connection is very sensitive to dropping out. Combine this with a congested interference environment and all Bluetooth devices can struggle, especially during phone calls