Bluetooth connection can depend on a number of variables including temperature, size of the room/area you are in, other devices around you, and sensor battery level. Motus' recommendation is to only use a live bluetooth connection when it is absolutely needed for throw by throw analysis. If you only want to record each throw and look at the workload and metrics later, allow the sensor to save all of the throws without a connection and transfer them at the end of the practice/game.
To improve bluetooth connection try these tips:
1. Keep the iOS device and sensor closer as close together as possible. This will improve the connection and decrease transfer times.
2. Eliminate any obstructions between the iOS device and sensor. Have the player turn towards you after each throw to improve the 'line of sight' between the iOS device and sensor.
3. Remove any unneeded bluetooth devices from the area.
4. Ensure that each throw is completely transferred before making an additional throw. The sensor cannot transfer data and record data at he same time so throwing while transferring will result in disconnections and missed throws.