plowthrough

Hi all, I have the 2019 Legacy with an Iphone 7Plus iOS version 12/13/14 that has the following issue. From time-to-time when on a call through Carplay, I will hangup and Carplay will crash and the Subaru software will show that the call is still ongoing and I will not be able to use car play again, nor can I play music, or hear anything through the audio. This persists until I turn off the car for a few minutes. How should I fix this issue? Thanks