This article will help you try to make a disfunctioning Bluetooth connection work between a Bluetooth device and your Jolla.
The below instructions reference a carkit, but you can use the steps with any Bluetooth device:
1) Remove the pairing from your carkit
2) Remove any trace of the pairing from your Jolla
3) Then re-pair your device, first starting the pairing from the carkit
4) Should this not work, please repeat steps 1&2 and then initiate the pairing from Jolla.
Remember to always accept all dialogs on both devices regarding the pairing and allow the devices to connect automatically.