Kia Troubleshooting Questions? Ask a Mechanic
There is a reset button right to the left of the bluetooth logo on top of the navigation unit. It's very small, you can hit it with a pen. Try doing that and see if that helps.
If my answer has helped you, please help me by rating or accepting my answer. This does not cost you any more, it just allows me to be credited for my work. You can always ask follow up questions after rating or accepting. Thank you.