Android Car Wired

Hello together, for weeks (feeling after the last update) Android car is as good as no longer usable: My mobile phone (now Xiaomi 12) loses the connection (if it exists at all). No matter which cable I use. Sometimes it works with the original charging cable. On the phone it is displayed then that Android car is connected, on the screen only “phone projection” is displayed (of which I don’t have a photo). When I tap it comes to that that I “certifate” a Does anyone have any idea what it might be about? Thomas