On multiple occasions I've had difficulty with both inbound and outbound calls changing from my model 3's speakerphone to the iphone handset, refusing to go back and stay on the model 3 when I select it on the phone. I've cycled the bluetooth on the phone for the model 3, also uninstalled and reinstalled the phone on the car with no success. I took it the Tesla service center and they told me that this was a known issue on the model 3 and they're hoping the next software update fixes it... Anyone else having this issue?