I have my Galaxy paired with my new car however, it was already paired with two other devices. I want to remove them as I no longer have them and I think they are causing some interference.
Try this, open settings > bluetooth > then look for the device you want to unpair > (a.) if there's an icon beside the name of the paired device, press it then click unpair (b.)try to hold the name of the paired device and see if something pops up then unpair.
Let me know if it works. :)