Bad audio quality after activating siri / microphone

Hi, I’m suffering from an issue with Apple Carplay on my Opel Corsa 2020.

The moment I engage Siri or activate the car’s microphone by filming or calling with my iPhone (for example), the sound quality becomes way worse then before. It’s not ‘call quality’ bad, but it loses a lot of bass and sounds really mono. I’m really scared to use siri when driving because the moment it activates, the sound quality goes to shit. However… It resets when I park > turn off the car after 5/10 minutes. Then the bass and audio quality is back to normal.

Does anyone have any suggestions or similar experience?? It really drives me crazy.