Bluetooth issues with Google Pixel 9 Pro

I’m looking for ideas on how to fix the Bluetooth connection between the Google Pixel 9 Pro and the CI Nucleus 8. While the connection is established, I experience issues during phone calls and music playback. The Bluetooth switches back and forth between the CI Nucleus 8 and the phone's audio, causing it to disconnect and reconnect every second or so. It doesn’t stay connected consistently. Do you have any tips or ideas on what is going on? I'm hoping it's not a compatibility issue. Thanks.